I have an AR/Dev with an expensive build I'm pretty happy with. I'd say AR can make for a very capable blaster AS LONG as you're on a team that has some kind of crowd control.. whether that be a tanker, controller, etc. You're gonna be very happy with flamethrower, ignite, m30, and full auto mowing down tightly packed mobs. However, this is the only blaster I have that I cannot stand solo'ing x8 with. You won't be doing enough damage with your alpha strike to clear the minions & lieutenants so some of them are going to run away and you'll have to chase them down. I tried mitigating this with web envelope but it didn't do the job. So just keep that in mind if you want a combo that will be fun to solo x8 content with.