i do kind of understand why a lot of people like martin more than erikson, but that perspective is just really alien to my own. in erikson's world the human characters are made aware that they're just a flicker in time, a speck on the arse of a world dominated by ancient forces unimaginably powerful, and all of them are tragically striving for some kind of meaning against this abyssal backdrop. it's like all the existential struggles of the human condition are pushed to the forefront and amplified, because the world is so extreme it doesn't allow for conceit and intellectual dishonesty, and so characters are forced into wise fearless perspectives i find incredibly powerful and admirable (even including many of the humorous gimmicky characters some of whom i identify with most of all, the place for humour within tragedy cannot be overestimated, and it certainly isn't by erikson). it ends up serving really extensively as a metaphor for the human condition, from where i'm standing, and in doing so it really reaches me at a visceral level. what it provides is pretty much exactly the same as what i get out of my other great love metal, incidentally.
also i think the characters usually give the impression of being very developed, but they rarely let you know them well enough to check - they keep their cards close to their chest, and you only really begin to understand them by observing their deeds or the few times they talk openly. some people view them as being indistinguishable, or as having no real content, but i don't get that at all. i love the mystery/potentiality and revelation tool he uses with his characters, the power in mystery is intimately bound to the anticipation of revelation, and because he has this way of hinting at really special qualities without actually revealing them (and because i tend to love the erikson characters i've already gotten to know), i get obsessed with these less known characters, full of wonder about them, like when staring into the shadows. the same applies with metal albums, just to give an analogy; when i approach a new album with evocative cover art, stellar influences named in the liner notes, a huge reputation and gorgeous descriptions from every tasteful person i know etcetc, the potential i perceive to be held within that cd excites me unimaginably, and eventually listening to it is like finally finding atlantis or something haha.
in martin, most of the characters are immediately defined by two or three stereotypical characteristics (the smarmy unpleasant prince, the tired honourable old man given responsibilities he doesn’t want, the young misunderstood girl who defies society’s standards – contrasting with her spoilt brat sister of course, the fat has-been king, etcetc), and then those stereotypes are turned on their head, or the characters receive come-uppances, etcetc, often in ways that are themselves clichéd. it's been a while since i read it, but that was the impression i got at the time anyway. i did like some bits, iirc i thought tyrion really transcended his status as bitter outcast, and a few other characters were interesting. i can imagine the stuff with the wall will be cool when it gets going as well. i just found there was too much in the way of medieval fantasy clichés for my liking, even if those clichés were being overturned they were still the focal point.
hopefully that'll do as some kind of basic explanation.