Two words: Vastly Overpriced.
Mellow Mushroom is hippie-chic for the trust-fund stoner. The place has a clean, bistro-ish feel, service is good (our waiter was a trainee and provided better service than many veterans), and the general ambience is pleasant.
The food quality is on the high end of average, but the prices... just looking at the prices made me dizzy from the moment I cracked the menu open. For drink and a small portion of whatever you end up being interested in, expect to pay around $12, before tipping. Small pizzas ranged up to $13. Drinks are $3 each, some of which don't come with any refill service.
The people aren't the problem at Mellow Mushroom, the cash-grab is. It isn't anywhere close to earning the kind of prices on the menu.
Thumbs down. The people who work here deserve not to have to be associated with (and probably forced to answer for) the prices.
Skip Mellow Mushroom. There's plenty of other stuff on Mill.