Are these issues on XBox or PS3?
I haven't noticed them on PS3. I usually play Hardcore Team Deathmatch.
I don't think there's a single online game that has never experienced glitches and that sort of thing. The code behind these games is so ridiculously complex, it's impossible to catch everything before releasing it into the wild.
People are smart...they figure these things out just for the hell of it. Gaming companies typically release patches to fix it.