The entire series is simple. That is the beauty of the series. A good laugh without being to complicated. You talk as though you have never played the other games. If you want to know what the rest of the game is like then i suggest you play it! If you think so little of the game then why don't you put it on Ebay and let someone with sense play it!?
Dunno how you can say that this game is simplistic. Took me awhile to get my head round the concepts, weapons, characters and enemies. One or two great boss battles too. Once you "get it" I agree it is quite simple - but that's the beauty of it. I can now just sit back, play and enjoy the beautiful scenery, landscapes and colour. Graphically it is awesome.