I didn't say to ignore "comments", I said to ignore "suggestions" -- there's a big difference. A suggestion is "make an enemy that breaths fire", a comment is "this enemy is hard to see".
I see what you mean now.
I'm not sure what you mean by how does one implement watching people play. You, uh, just watch them play. Read Auriea's posts for a concrete example.
Well how many playtesters are you getting? If you have like five, I guees you can watch them play, but only for so long. If you have more you can't have each person send there whole play time, nothing could ever get done. Even more so how can you get too see you like 20+ playtesters unless they are all in your town/city?