I'll be honest, when it was first introduced (or when I came back from a long absence, forgot which was first), I had some real issues with the like system. Granted, most of what I had to complain about was hypothetical stuff that never came into fruition. But at the time, I had issues with it. Add the fact that I thought it was becoming more "Facebooky", and I was seriously bothered.
Today, though, I don't mind it at all. All my negative assumptions proved false, and I'm happy for that. Personally, I don't like people's post all that much, but I do every now and then. And I do like it when my post gets liked, I'll be honest. =P