I believe this is obvious malicious underrating. It's not the greatest coaster in the world, but 0.5's across the board? Come one...he even says in his rating that he thinks the person spent a lot of time building it and doesn't really back his numerical ratings up at all.
Interestingly, I think there is also a bit of overrating on this same page. Oh well, maybe they cancel each other out.[:D]
http://coastercrazy.com/track_exchange/de ... p?tid=1432