I was playing a random Tower Defense game the other day, and realized that's yet another of the things I liked about CoH. While I certainly enjoyed my Brutes, sometimes I wanted a different playstyle, and several AT and powersets let me play as if it were a Tower Defense game. I'd just worry about where and when to put things down, and then sit back and let them take care of enemies for me. (Things like Masterminds with pets in Aggressive mode, Earth Control with all its area-targeted powers, Traps with all of its... er... traps, etc)
Is there any build in CO like that, based mostly around just putting down Zones Of Death and then letting the enemies stumble into them? (Aside from an all-pet build, I guess, but pets don't seem to be as durable or as reliable in CO. Plus if I have too many of them my framerate drops to even lower than the usual one frame per second I normally get)