How many froyo places do you know of where you can go and get a smattering of as many flavors as you wish? Not a lot. Razzy's flavor selection can't be beat. And, as others have commented, they are super-convenient to both the Pitt and CMU campuses - especially for study/work breaks.
Fav flavors are french vanilla (doesn't really taste fat-free, but I'll take it), and the taro (tart) flavors.
Agreed that the yogurt consistency can sometimes be a bit on the runny side. Best to test before committing to a bunch.
One other let-down is that some of their toppings are a bit off. For instance, I don't know how old the peanut butter cup topping that they've used lately is, but it tasted pretty stale, and not so much like peanut butter cups (yikes). Generally, I avoid non-fruit toppings and stick with the basic froyo.
If I could give this place 3.5 stars, I would, but let's throw them the benefit of the doubt and just say 4.