LOVE:
Instant hook, atmosphere, considered setting, writing that's seen some work put into it, research, a voice, a purpose.
HATE
Anime cliches (I used to do them), lazy setting, generic characters, too much angst off the bat, truly bad art (it's not as subjective as you think), meandering, filler (I don't know how anyone who has to draw everything they write can stand to write boring filler crap)
I also hate self-indulgence, but my comic is pretty much entirely that, so I can't really put it (though there's some bad art in there too!).