I've been here a few times thanks to the relative convenience of just being a short walk away from work. The food here is decent, the portobello burger is actually interesting, the mini burgers are not bad, and the regular burger doesn't have much flavor to it.
The issue here is of course the service. It just takes way too long to receive your drinks, receive your appetizer, receive your entree, to receive your check and even to get your card back. It would be understandable if it was during a busy night where the tables were full and the servers were running everywhere, the only problem is every time I've been here it's usually nearly empty and somehow the employees still seem to disappear.
The one thing it does have going for it however is its location right at the edge of the Freemont Street Experience. So if you want to sit on the outside area and just relax and people watch, it can be enjoyable. Avoid eating here though if you're any sort of time constraint though. Although I'll admit, I kind of want to have that portobello burger again.