Almost all of the flash games I see are rated unfairly, with comments such as "BOROORING" and "BAD GRAapIHCS N00b!" or, on games such as Llama Text Adventure "TEhre R nO eNEmies!1!1" Time to grow up. Not every game is going to be a zombie survival. Stop rating games based on how much stuff you blow up. The developers aren't obligated to make games for you, they do it because the want to. Flash games should be rated on replayability, how fun it is, innovation, etc. So start giving constructive criticism or don't rate it all. Really, you aren't helping.
90.14671201% of comments aren't helpful at all and simply state whether the game was appealing to them or not. Or they don't make sense at all. Seriously, if those people want to see better games they might as well try to make the games themselves, or at least leave hints trying to help the developer improve. Some people don't remember that other people exist in the world, and seem to think the games exist only for them to play, and will gripe they don't like it. No game is going to capture the hearts of everyone.
you can't stop it, and its nto affecting teh overall rating of the game, 90% of the votes are actually correct, cuz if they werent, the ratings of games would be all below 5 or above 9. the spammy comment may be noob but most of em are true, spamming a rant about it isnt gunna help and isn't going to send a message, people in teh forums usually dont rate like noobs so don't bother.