I sort of hate that these achievemets really focus on2 things: Being a hardcore player or being a lucky dude. There are far fewer kind of gradual achievements than in the past. Stuff like glitchy rocket jumping and juggling are really fucing hard for people like me who pop in for maybe 45 mins a day. In the past there were always achievemtns like "Kill 200 guys" or "Do 10,000 damage" that you could work towards even whe you were losing. There are way fewer of those in this pack and as a result I feel kind of like I'm wasting my time.
I really wish they'd ditch the achievements, let all classes have their weapons from the get-go and you pick your loadout.
As far as hats go, I think they're stupid. The massive shit-storm the 'halo' thing brought up is stupid, and they should really be done away with. TF2's patches remind me of WoW's patches. They're usually massive and go from making the game 1000 times better to 1000 times worse.
Also, the fact that some classes have like 5 alternate weapons while others only have three is stupid. Specifically, the Demo/Soldier updates were massive compared to the Medic's or Pyro's.