+ Mastdon, The Smashing Pumpkins, King Crimson, Funkadelic
~ Gorillaz, QOTSA, Nirvana, Metallica, Yes, The JHE, Rush, Megadeth, Pearl Jam, Daft Punk, Gnarls Barkely
- RATM, SOAD, Dream Theater, Arcade Fire, Modest Mouse*, Wolfmother, Sublime, Tenacious D, The Strokes
-- Pink Floyd*, Led Zeppelin, Muse, M.I.A.
--- Van Halen
Overall, you mainly just have some radio rock material and the entry-level albums and artists to getting into some really good stuff (Nirvana/Pearl Jam can be a bridge for some people into Pixies and alt-rock; Modest Mouse into some good indie rock; etc.) but at the moment your taste is pretty much representative of someone who just started taking music seriously. Unfortunately, I can't soften my rating because of this, and generally, most of your stuff ranges from bad to worse, so
*I investigated these plays to see which albums you were listening to, since some are great and some are awful. The rating I gave is representative of my opinion of the majority of the albums you actually scrobbled, and not the artist themselves in these special circumstances because of the wild change in quality from certain albums and groups of albums to others in my opinion.