If you're a metalhead, then this game is worth every penny. Fantastic soundtrack, great voice work from legends like Ozzy Osbourne and Rob Halford, and an aesthetic that screams pure metal. This game gets metal, and it gets metalheads, no question about that.
If you're not a metalhead, then this game is a lot harder to recommend. The combat isn't great, and the RTS elements don't have a ton of depth to them. Then there's the fact that the second half of the game feels extremely rushed in comparison to the excellent first half.
As for the PC version, it has everything you expect, and nothing more. It runs smoothly at an uncapped framerate, and there are no major issues that I know of (then again, I haven't really played a ton of the PC version, so someone else's opinion on the matter is probably more valid). It controls fine with a mouse and keyboard, though it isn't really any better than the gamepad controls.
Edit: I want to emphasize that the RTS sections control the exact same way with mouse and keyboard as they do with a gamepad. That being said, this isn't a huge deal because the best strategy is to just send your entire army at one point and then wade in and kick ass yourself. I just wanted to clear this up.