One thing you do have to understand is the people who really back this game and put in a tonne of effort to making it better and improving it are the people in this forum.
There are tonnes of people who make maps, mutators, weapons, people who dedicate their FREE time to testing 100's of maps to ensure they are exploit free so TWI don't have to do the grunt work themselves, people who make fan artwork, people who write fan stories, the list goes on. Our opinion is by no means more valid than yours, however we have put a hell of alot more dedication into the game using our own free time. We were the ones that spent what was it? 7 weeks testing the various beta revisions? It was an open beta, anyone could have taken part, but we were the ones who put aside the time to actually do it.
So they added the vent in the U room, and? You say just snap round and blast them to kingdom come? Well doesn't it just feel that much better that no matter what the game threw at you you beat it anyway?
Now about this Sharpshooter rant... I assume you played Sharpshooter before the update? Let me ask you a question... Why did you play sharpshooter? There are 6 other classes you could of played, why did you mainly play Sharpshooter?
The answer is the Sharpshooter could kill everything with ease. 1 bullet, guaranteed kill, everytime. Think of this in any other game. Would L4D be any good if you could just take 1 gun and kill every tank, witch, smoker, charger, etc with 1 shot? No, it would suck. And that was what was wrong with Killing Floor.
There was no point in playing any other class. In fact it got to the point TWI might as well have just taken perks out of the game completely and just made everyone a Sharpshooter, cause thats what every server was full of. I think I only ever met 1 Berserker in 1014... then he changed class for wave 2 to... a Sharpshooter. Met maybe 2 Support, 0 Firebugs, 0 Demo Experts, and maybe 3 Medics. Sad figures really
I'm sorry to hear you dislike the changes. I figured the requirement to hit every headshot to get your kills would be a skill you had in spades as a main sharpshooter. The update shouldn't have even phased you. However even if not, I would personally assume that given your apparant skill as a KF player that the challenge to up your game and take your gaming experience to the next level would be something any gamer would relish...