I think that bots need to learn to do their objectives more. If its the start of the round (on de_ maps) then go ahead and let the bots roam around, but if for any chance that the bomb were to fall, the bots need to be able to work their way to it. Then after the bomb is picked up, they need to plant it (the bots can plant but they need to be able to plant more often). Then if a bot planted the bomb, the bot need to be able to move to a different location near the bomb and be able to guard it for at least 25 seconds. While the ct's try to go to the bomb, clear the area, then defuse.

Oh, also i've noticed that when the bots camp at spawn, sometimes tking them will get them to start moving again...