Having seen stats for New Digimon, I'll try to see how they fair.
Miragegaogamon BM is disappointment, almost inferior to old one. No amazing evasion, instead it tries to increase INT while being mixed attacker.
Ravemon BM seems ok, although it may just be slightly stronger support unit.
Rosemon BM is also ok support. Her Pierce is only single Pierce, so its not too strong. Supports HP absorbsion rather than speed.
Valkyriemon is alright, kinda average stats although speed is good, but his special attack has 15% death chance, which could work. Seems OK backup unit.
Darkdramon is same, but instead of speed its power. Maybe the most basic one, but it could work.
Chaosmon is pure classcannon. Very easy to kill, so raw power isnt broken.
Shinegreymon BM is fucking borked soon to be OP. 200 Powered signature attack that hits everyone WOW. It decreases own attack but that is insane power. Btw, the strongest single target attack has power of 150. Old multitarget one attack was 115. This is beyond broken what the hell. I guess this is how Defense gets important? Haha... Shinegreymon BM will cause mayhem.