Its indeed the best Gears so far.
But I still have some problems with it:
1. They haven't found a good way to deal with collision between teammates. If you roll back and your team mate is there, you just get stuck there and boom, you get shotgunned. I wish they were a bit more considerate, specially when the characters are a huge block of collision.
2. Better communication tools, I can't believe they haven't tried something like Pings or the Overwatch command wheel. I know it has emotes, but it needs something better.
3. Also if your team mates leave, they don't get penalized that badly atm. This always has been a problem with gears.
4. Even at full sensitivity, the game is still slow compared to mouse and keyboard users. They should allow for faster turning even in controls IMO.
5. Also if 2 people are in cover and they bump each other, one of them gets fucked up and you can't really do anything about it.
Besides that its fun, but they need to improve in some more areas IMO. They have done great improvements over 4, but it can still do more.