I see loads of helpful criticism, suggestions, ways to fix, as well as praise all the time.
That's a good point for MTS specifically, and I sort of forgot that when I made my reply. I know I've seen some really nasty critiques and really nasty responses to polite critiques around the community back in the day when I used to frequent more sims sites (sims 2 only, I never really got online much during Sims 1) but because of what seem to be solid moderators and whatever other factors, the comment threads at MTS contain a lot of great discussions while modders work out kinks, if they have any to work out.