I don't think you do it badly if you only comment a certain amount of pictures. It's the quality of the comment which is good or bad. Judging all pictures in the critique group is impossible for nearly all of us. We need good critique, and you provided a lot. I would be really happy if you would change your mind, but it sounds as if you made your decision. I just hope you re-decide at some point in the future.

A ship in port is safe; but that is not what ships are built for.
Sail out to sea and do new things.
-"Amazing Grace" Hopper

Avatar image of me done by Chidori.