I made a similar experience as SnowSultan. I do the "This is great" show quite often, and I don't feel ashamed about it. I only do it when I really like an image or when I see that someone's making good progress. Quite often I find it hard to be more specific. And if I like an image, it's as with people I like: I tend not to see their flaws. :-) I also occasionaly point out things I don't like about an image or try to make helpful suggestions. I try to be gentle and friendly and start with what I like before I blurt out my criticism. If I don't find anything positive to say, it's probably not worth it to say anything, so I don't. I've never ever had anyone complain about my comments, but quite frequently people thanked me for pointing things out. The funny thing is, those were usually the people with the most skill (my personal, subjective judgement). So, either these guys have enough self-confidence alright to admit making a mistake or the reason they got so good is that they embraced criticism and really worked hard to get better. Which one do you think it is. ;-)

-- I'm not mad at you, just Westphalian.