And I've seen it many times before - there are 50 or 100 thumb ratings - and there has been a problem with the download meaning nobody has been able to download the giveaway.
Or the ratings are in the first 60 seconds of a giveaway - enough time to download, install and evaluate? Perhaps they have used the program before - and are rating based on past experience? who knows....
To demonstrate how comment voting works (an example only)
There are a few regulars who post along the same lines I am thinking - which only shows they know what they are talking about... naturally I'll vote them up.
Users who disagree with what I think - will get voted down....
Users who say "It's free - don't complain - it must be good software-because it is free"... I will vote down.... or delete as an offensive comment (before my brain explodes).
So - as you can see the logic applied to voting and comment votes doesn't always follow rational rules - getting people to type in a message before they can vote will only mean there are more "empty useless" comments - that have go through moderation just so some of the monkeys in the peanut gallery can have their say.
Of course there are some users who stick out like in the song - "One of these things is not like the other, One of these things just doesn't belong". After a while you will get to know which users these are - and how much value their comments have - but only by trying the software and relating your experience to their words.