Ehhhh I dunno. Not really keen on fighting AIs...the main reason I played TF2 for so long was that I found the versus action to be fun enough, and as Valve gradually diluted it my interest in the game fell off a cliff. Not much confidence in their ability
As for what I think of all the weapons added - basically they all fall into one of two buckets:
1) Highly situational and/or gimmicky. Also annoying to play against (see pretty much every new Soldier weapon since his original unlocks)
2) Most players don't know how to use it but skilled players will dominate with it easily (see Pomson, Wrangler)
I still pretty much use vanilla loadouts with all the classes I play (the exception being Pyro but I don't play him that often).