The enigma machine is a bit of an enigma to me. The top 100 who got it are most likely all high level SA players, and this artifact would be far more useful for lower level players who haven't already completed their library and all/most of their uni. The other perks help a bit with grinding, but it's not that hard to five star MP bases as is. Cool reward, but it ended up in the hands of people who don't need it.
As for the event, I would like it structured so that if you hit certain milestones you get the prize, regardless of your leaderboard rank. The groups, in particular, were a total crapshoot. My main required 500K to win, my alt required 50K.