KISS fans will love it but normal gamers may find it boring.
The games graphics are very bright and colourful, the last thing you'd expect from a FPS game but nothing about this game is normal. The Lithtech engine does a good job with the graphicsin the game but there by no means revolutionary.
The sound effects and the level music are below average which in my opinion is quite a disappointment. The hidden jukeboxes that play KISS tunes is a really good idea but I think the game would have been a lot better if you could have been running around the game while listening to KISS songs.
The game does have it's problems and one of them if the indifference in the characters you play. They two differences between them are the cosmetic difference of the characters and the slightly different look of the realm for each character. There's simply no real distinction between the characters.
KISS: Psycho Circus is a strange and non main stream FPS that's worth a look but don't be expecting anything revolutionary.