I think it's a damn fine candidate for a short range combat rifle, and I'm sure plenty of people have met their demise at the hands of one.
It's capable of IMO, acceptable combat accuracy, meaning that if you practice, you should be able to hit a man sized target.
It's not as "modular" as an AR, and without aftermarket mags (which aren't combat proven), it won't lay down as much fire as an AR. But it has it's own advantages.
stripper clips can be a plus, you could carry more ammo on you than you could with 30 round mags.
If you use it how it was intended to be used, and not try to turn it into something it's not, I think you'll have satisfactory results.