DamnEasyCTF would be horrible, if you cap 1 or 2 flags you just get 5 man defending your flag, and if they try to push you with 6 you just have 1 scout or spy or w/e backcap the flag.
With traditional maps, yes. That's why CTF would need a bit of a rework - greatly reduced flag despawn timers, different map positions for flags, and switching to a "most caps in X time" rather than "first to 3".
What if the CTF worked more like Doomsday? Have a neutral intel in the middle that both teams have to fight for (which doesn't unlock for a certain amount of time), but have the cap be on the enemy's side so they have to push in. It would work sort of like 5CP (although one person would need to cap), but if the intel is dropped for too long the entire round resets (which helps prevents stalemates).
I'd like to at least see it attempted. Also the player outlines would have to be disabled.