I myself am from Magnitogorsk, been living here for almost 5 years now. With a 500k population, lots of smog from the industrial areas found on the left bank of the Ural river it's not really the place your regular tourist would want to visit. Nevertheless, Magnitogorsk has it's own beauties, hot spots, etc. and can be considered a typical rapidly developing city. Not as fast paced and hectic as Moscow, Magnitogorsk city life is pretty enjoyable, with quite a rich history for a young city (founded 1929), great entertainment, etc.
Well, that's a quick insight (call it biased if you will), but, if you need more information, I'd be more than glad to share by e-mail which is MastaG@mail.ru