It depends.
The bots on both teams should be the same skill level now. However there is a marked difference between bots on offense and defense. The defense bots will cluster up constantly, while offense bots on cluster around objectives. If you find your bots are getting teamed up on, try pushing with them (same goes for playing with real people too).
Medic bots (and soldier bots to an extent) are selfless team players most of the time. If you go down (or run out of ammo) they're going to do their best to fix you up, often ignoring nearby enemies.