Though oddly none of those parties (you mentioned) I've checked so far have given it 5/5 stars, only 3 or 4...
Both of your posts in this thread indicate you have absolutely no idea how Rotten Tomatoes works.
Here, I'll explain it to you.
First off, the reviewers cannot be just any random guy off the street. It has to be a reviewer with a real readership. They actually have the criteria for acceptance listed right on their website. Yeah, it can be a blog, but it has to be a well-read blog. You can't just have Joe Schmoe Blog with 1000 readers and get accepted as a reviewer.
If a reviewer gives it a positive review (eg. 3 out of 5 or 5 out of 5), it is considered a positive.
If a reviewer gives it a negative review (eg. 1 out of 5 or 2 out of 5), it is considered a negative.
Then they add up the numbers of positives and negatives and provide a score. 25/25 is excellent for a pre-release movie. Based on that score, I'd expect the score (over 100 reviewers) after the movie is actually released to be over 75% possibly as high as 85% or more, but the range may be something like 70% to 95%. On Rotten Tomatoes, anything 60% or better is considered positive.
If you want an average on the ratings, then go to Metacritic.com where they average them all out and give out a metarating.
Currently on Metacritic.com it's 77, based on the reviews of 12 critics.
http://www.metacritic.com/movie/guardians-of-the-galaxy