The groan is because:

a) If you're familiar with them, you probably already know what to expect

b) If you don't like them, you don't want to see them

c) If you like them, you've already read it, and

d) If they've been on a lot recently, you can't use # of comments as a judge of quality - they might just be complaints about "Everything Seth Godin says is common sense" or "Jeff Atwood couldn't code his way out of a paper bag", and those are no fun to read.