I was playing ctf_2fort on casual for a while and after 10 minutes or so, he game almost stopped......not literally but there was nothing much you could do.....sentry nests of both teams would sprout up practically everywhere...tried to uber 2 heavies but still there were too many sentries....its probably the fact that capture the flag game mode doesn't have any time limit, allowing dumb f2p engineers to sprout up everywhere....(not an insult to f2ps, just my observation that most of the engineers had no clue what to do except making sentries). IMO, Valve should add a time limit to CTF OR limit no. of engineers per team to 2 in a CTF round....Your thoughts can differ....