I guess it's *PROBABLY* worth $15, just don't get it expecting it to look even as good as a Gamecube game (which is really unacceptable). I'm one who'll always harp on gameplay over graphics, but when it's this obvious that the developer didn't give a damn, well, that's a bitter pill. Even the cut scenes look like they came out of some early 32-bit game (early Saturn or PSOne, 3DO, CDi, Jaguar CD (despite its 64-bit"ness", you get the drill), as the characters are composed of few polygons and the resolution is so low that artifacting shows up as giant blocks. Ugh...
Of course, you might be able to forgive that if it controlled great, but controls are sluggish and only so-so. I don't think we're going to see an FPS done right until Metroid Prime 3 hits.