I myself am having a hard time appreciating a lot of modern/contemporary music these days. It all sounds like "oh,
another one of those bands

."
THAT being said, I do think that every genre produces great bands, and it's easy to identify which ones are the founders, which are the defining acts, and which are popular more because they're copping the styles of the previous two. I like a lot of Mogwai and Sigur Ros and some others for a few reasons:
-they were/are defining acts for the genre
-they were the first acts I heard in that genre. I think that the first bands you hear in any style that make you like that style will often times be the ones you like the most.
-I feel like I can emotionally connect with them. This isn't the "post metal thread," but I'll compare Isis and Pelican. I LOVE LOVE LOVE Isis, but Pelican puts me to sleep. Isis had riffs and songs that had great dynamics and tension, Pelican just.... meh for some reason. Take Russian Circles. They follow the post-rock formula, kind of. However, I can think of melodies they've written that I like right now. Easily. Pelican, I have no clue.
-The bands that are "good" write memorable and moving riffs, melodies, and lyrics. "Catchy" isn't the word 'd like to use, because it makes me think of a jingle, but "memorable" I'll definitely use.
So in answer to DarkAxel's question: someone is only a hack if they're hacking some one else's riffs, melodies, lyrics, and the like.
While I'm posting here:
Nadja does a good job, in mt opinion, of writing "post-something-whatever" music that somehow doesn't sound like anyone else to me. A lot of Aiden Baker's solo stuff is pretty different, too.
http://nadja.bandcamp.com/album/queller
