I would tend to lean towards Moto on this one.
HOWEVER -
The critique should be about the work's merit (or lack thereof), not the writer. I think a lot of writers (especially new, young writers) attach a lot of ego to their work. That isn't the problem of the reviewer, but the reviewer shouldn't worsen things by attacking them personally. (and I haven't seen any of that here, but I have elsewhere)
I also think that a lot of writers write and review in a vacuum. They don't rewrite, because they can't bear to "kill their darlings". They fall in love with their work, and let their friends and family read it. Their friends and family are obligated (in most cases) by some faulty sense of morality to say "oh, that's nice." "no,no, I really like it!" "You should be a writer!". This encourages them, and they decide to toss it out here for the "real world", expecting writers everywhere to lay down their pens and gather 'round the glowing brilliance that is their work. Now, the person in this situation needs to have some intestinal fortitude or they are going to be emotionally shredded, because they haven't separated their writing from themselves. Their sense of self worth is based on this writing. But, their reaction to "constructive criticism" is their CHOICE. If the reviewer writes "The dialogue is weak and stilted" and the writer reads "You can't write, why don't you die", with whom lies the fault?
I don't think critiques should be tempered based on the author. When one throws his or her proverbial hat into this ring, they should be mature enough to accept what they get. If they aren't, then they probably aren't ready to be published. Maybe they will lick their wounds, come back for more, and, eventually, build the requisite tolerence. Maybe they will run sobbing to their mothers and never come back again. Either way, the outcome is the decision of the writer, not the reviewer.
So, I guess I'm trying to say, be honest, but not personal.
At least that's what I want when someone reviews my work.