You know, just as all free things aren't good things, free work doesn't necessarily mean good work.

You playing the game once or twice, see something weird, rant about on the forums is not as valuable as a professional beta tester's feedback.

My friend who was a tester said that when he saw a bug, he had to play through it again and again to record the conditions that precipitated the bug, determine if it was reproducible, etc. and produce coherent QA reports under deadline reports for the programmers to read.

Don't flatter yourself and think you are doing them some kind of amazing favour by your "free beta-testing"