Probably. I haven't played any in awhile but when in doubt... you tube it out. Here:

Fortress 2 griefing
http://www.youtube.com/watch?v=JUPzN7tp7bQ
MOHAA wall hack +aim bot
http://www.youtube.com/watch?v=5KVm12lzOY8

Don't get me wrong, love it when these games first came along, yo.