Awesome happy hour prices and a huge selection of tap beers. That's the only thing Mellow Mushroom has going for it. The appetizers are decent, and I usually get an order of the pretzels with beer cheese when I go, but they are underwhelming.
As for the pizza- it makes me sick every time. Every. Time. I have never had issues with pizza (in fact I just finished lunch at NYPD Pizza) before so I'm not sure what the deal is, but I assume there's something going on in the kitchen that I would rather not know about.
I'll be back for the beers during Happy Hour, but that's about it.