I kind of share Daisy's view on tabs, but mostly I just find it impossible to play along to them. I'm not above using them as a guide when I'm first trying to learn something. But really there's no replacement for a good ear and good muscle memory. A lot of it is just rote memorization but then so is any skill to some degree.
I'm willing to learn just about anything if it'll give me a better sense of chord shapes and where to find the notes on the neck. Knockin' on Heaven's Door is one of my favorite songs to practice because it's not a fast song and can be played a bunch of different ways.
Really what I'd love to be able to play is the more intense forms of metal, which means I have to get better at playing fast but then there's stuff like Funeral Doom and Depressive Black Metal that tends to be played slow yet requires just as much timing and precision as anything else. So I kinda look at those as the training wheels to some of the stuff I'd like to play.
I also like Marilyn Manson though I find some of his songs all but impossible to really replicate on my inferior (and non-digital) equipment. I don't even have an effects pedal so yeah, I've kinda had to limit myself to just the straight-forward guitar parts of his songs.
Of course there's all the grunge shit I grew up listening to, a lot of which is pretty simple but some of it is pretty hard to get just right. Before I stopped taking lessons my teacher had me trying to learn a bunch of Kiss songs and it's not that I don't like them but it's like the rhythm sections are too simple and the solos a bit too complex for where I'm at in my development, most of them.