Onslaught - Bots, even with the highest skill, camp near isolated control points.
I've been playing Onslaught against "Godlike" bots on Courtfun, playing around with cvars. Onslaught is probably my favorite gamemode.
I often find that at least one bot is camping near the first control point for each team, not moving at all unless an enemy player appears (sometimes even if an enemy player appears), and that number increases by as much as 5 when I set g_weaponarena tuba (yes, I know that's not normally supported)
This makes such bots easier to defeat than should be the case.