First off, I love love love the war replays. I've been waiting a long time for them. Thank you very much Nexon team! You guys are doing an awesome job on my favorite game ever for the last two years. I would love to be your permanent beta tester (Hint hint. Wink wink)
Pros: We are tipped off of trap placements and artillery/other siege troops hiding the enemies town centers. No more guessing games! we can finally help low level and alliance members with poor strategies, instead of trying to explain strategies ineffectively in chat. We can see how well our war bases are defending and modify them according. It's fun and feels good to see the enemy alliance fail miserably on our bases.
Cons: Enemy alliances are now tipped off about our trap placements and troops hiding in our town centers. It is already embarrassing enough to get 0 or 1 stars but now everyone can see how poorly you did over and over again. Some more hesitant members of the alliance may wait even longer to attack or not attack at all due to the sheer anxiety of failing in front of everyone else. Enemies can see what type of troops and strategies you use and may copy.
I mean these war replays give teams with poor communication and poor strategies a more level playing ground. High level teams with good strategies and great communication will be perturbed that all their "secrets" are getting out. Yeah right! I've been playing long enough to know there aren't any real secrets in this game. There are only so many strategies and ways to win. Same troops, same defenses in slightly different layouts (unique layouts are few and far between) for the most part. I definitely think this will make war way more interesting even for alliance members not in active war.
Glitches: I had problems with the war replays getting stuck on the loading screen on my iPad 4. However, on my Samsung Galaxy S6 Edge Plus the war replays loaded quickly and smoothly. There were a few instances when the game crashed on my Samsung but the replays I watched were accurate in stars and battle. I still couldn't get the replays to load on my iPad 4. I also noticed my alliance chats disappearing and reappearing after I watched some war replays on both devices. The chats disappearing actually have been happening since the last update, so I don't know if it's related.