After one happy hour visit, I can only give three starts. But I suspect that will improve during subsequent, and inevitable, return visits. I just can't say I'm a fan of anything after only one visit.
Mellow Mushroom has an excellent beer selection, including several craft brews - including Orange Blossom, from Papago Brewing Co., and a couple of flavors from Four Peaks.
I was really in the mood for chicken wings when I walked in the door, so finding out they were half off during their late-night happy hour was an awesome plus! Apparently, all appetizers are half off during happy hour too, which is great if you get the munchies while drinking.
Lastly, this place is open until 2 a.m. every night. This is unique in the Happy Valley/Anthem area and very welcome during the hot summer nights!