Your Group is Missing a Role

[Sunseeker]

As long as a controller just targets people who can or don't mind "taking" damage, then it's not too bad. One of the wizards amongmy players asks the party, "I'm going to do x, is anyone NOT okay with that?" And they usually are, accepting that the damage that he does is for the sake of hurting the enemies.
And they all know that the first thing he usually does it put up a fire wall.

This is less of a problem at higher levels, but in low-level games this can still get kinda iffy.

To be honest, I've found a fighter with cleave and a wizard with MM can clear out most situations with no trouble.