I did enjoy playing Prospekt however I found that it lacked any objective other than the "Freeman needs help" talk at the begining. There was also no sense of progression since you acquire pretty much all of the wepons quickly and there are no other characters to tell you what the hell you are doing.

The levels were very interesting to look at but didn't have any pacing between them and should have been padded out with a few more puzzles not just find all the buttons and wait for a hord of enimies to rush into the room.

In short if you don't really care about the story and just want a nostalgic but fresh feeling this is the game for you.