The comments, from what I understood so far in this contest, are made to make a minimum proof that people are actually listening to the songs and not spoil the results. Ok, they are now maybe more than just proof of that, they are kind of fun, reasons to argue with other players :), strategy about what you should send in the future and a lot of other stuff. But I guess the original idea was to be able to proove that you listened to the songs, so just writting short comments about the fact if you liked an entry or not is just spoiling the results and has nothing to do with their reason. So I am not a fan of short comments at all. On another hand, I've seen, multiple times, people commenting very short and in a non-suggestive manner that were not penalised.