As far as I'm aware, the only 3 unit stats changes in the last year were the ShieldMaiden, Commandos, and assault infantry. The first isn't even a trainable troop, and the second two did help a bit.
We desperately need unit tweaks to make them balanced and actually see some action.
Bombers - I haven't seen a bomber used in an attack in over a year. I can tell you why: they die far too easily. With a single un-upgraded SAM capable of taking them out (and there are 4 of them on the map), it's a pretty bad idea to even attempt to use one, especially since they take up 2 air space. 2 fighter planes are better in every situation. Bombers need significantly more health (we're talking 3x more), then they might have a place in players attacks again.
Armored Cars - I've never seen one of these attack me...ever! Why spend valuable oil on something that a very cheap motorcycle raider can do just as well? I really don't know how to make it worth the cost, to be honest. Maybe being able to attack resources as well as troops simultaneously? I'm sure a lot of work went into this unit, so it's a shame it is never used.
Attack Helicopters - These were pretty good when released, but then the sniper towers were added, which pretty much killed any kind of gameplay with these units. Helis are almost guaranteed to be the furthest unit away from sniper towers, so they are targeted and go down quickly. Consider making them immune or take greatly reduced damage from sniper towers to see these units used again.
Mortar Troops - These are a hard sell for many players. They do splash damage, but fire very slowly, and by the time the shell actually lands, the target has moved, wasting the whole attack sequence. They are also pretty useless until the range upgrade in the library is researched, but even then, howitzers do a better job in almost every way. A larger splash damage radius might help balance these a bit more, to reduce the wasted shots, and make them at least an option to replace cannons.
APCs - These are actually good units. The one change I'd like to see is that the first wave of troops spawn instantly or after 1-2 sec. The problem is that the units move forward into danger before they have time to even spawn troops. This is a minor change to help the deployment, but otherwise, it's a balanced unit.
Machine Guns - I haven't seen these used against me since I was in Enlightenment age. The big problem is they go in front of the troops they are supposed to protect and die. I think an AI change can make these units useful. Make them guard nearby units (similar AI to the healing cart), and engage enemy units nearby. If there are no enemy units, they just follow them like a healing cart and never shoot buildings.
Commandos - Again, never seen these used much after Enlightenment age. The obvious tweak is to make them immune to traps, as many have suggested. If that's not an option, reduce their stats to be similar to the ninjas, so that losing one on a trap isn't a catastrophic loss in army size. The housing space reduction helped a bit, but more changes are needed.
Everything else is pretty good. The above need the most attention right now, especially the first 2.
We desperately need unit tweaks to make them balanced and actually see some action.
Bombers - I haven't seen a bomber used in an attack in over a year. I can tell you why: they die far too easily. With a single un-upgraded SAM capable of taking them out (and there are 4 of them on the map), it's a pretty bad idea to even attempt to use one, especially since they take up 2 air space. 2 fighter planes are better in every situation. Bombers need significantly more health (we're talking 3x more), then they might have a place in players attacks again.
Armored Cars - I've never seen one of these attack me...ever! Why spend valuable oil on something that a very cheap motorcycle raider can do just as well? I really don't know how to make it worth the cost, to be honest. Maybe being able to attack resources as well as troops simultaneously? I'm sure a lot of work went into this unit, so it's a shame it is never used.
Attack Helicopters - These were pretty good when released, but then the sniper towers were added, which pretty much killed any kind of gameplay with these units. Helis are almost guaranteed to be the furthest unit away from sniper towers, so they are targeted and go down quickly. Consider making them immune or take greatly reduced damage from sniper towers to see these units used again.
Mortar Troops - These are a hard sell for many players. They do splash damage, but fire very slowly, and by the time the shell actually lands, the target has moved, wasting the whole attack sequence. They are also pretty useless until the range upgrade in the library is researched, but even then, howitzers do a better job in almost every way. A larger splash damage radius might help balance these a bit more, to reduce the wasted shots, and make them at least an option to replace cannons.
APCs - These are actually good units. The one change I'd like to see is that the first wave of troops spawn instantly or after 1-2 sec. The problem is that the units move forward into danger before they have time to even spawn troops. This is a minor change to help the deployment, but otherwise, it's a balanced unit.
Machine Guns - I haven't seen these used against me since I was in Enlightenment age. The big problem is they go in front of the troops they are supposed to protect and die. I think an AI change can make these units useful. Make them guard nearby units (similar AI to the healing cart), and engage enemy units nearby. If there are no enemy units, they just follow them like a healing cart and never shoot buildings.
Commandos - Again, never seen these used much after Enlightenment age. The obvious tweak is to make them immune to traps, as many have suggested. If that's not an option, reduce their stats to be similar to the ninjas, so that losing one on a trap isn't a catastrophic loss in army size. The housing space reduction helped a bit, but more changes are needed.
Everything else is pretty good. The above need the most attention right now, especially the first 2.