Like I said, Ultra is known for their hits and misses. Some of their newest ones have been getting better .. still not something I would put into one of my builds (well, serious builds. I am thinking about building a file server ... and I don't care what goes in there.) I know what you are talking about, review being positive is a really great sign. Maybe you just got yourself a lemon. It happens, I mean my motherboard is down right now ... some are just bad apples.
If you end up getting another bad one .. the brands I would recommend (due to reviews, personal experience, and friends experiences) are Corsair TX series, PC Power & Cooling, and SeaSonic (Corsairs OEM). I have 6 HDDs, 2 DVD burners, 1 GTX 285 and a Core i7 all running on a PCP&C Silencer 750 Quad (LINK). It has never once faltered, though if I were to add anything else I would not feel comfortable without moving up a power level (1000w at least) ... but this thing is SUPER strong and is rated for 750 constant.