Korriban - 8 (Loved the start of the story)
Dromund Kaas - 9 (Love the environment and story)
Balmorra - 6 (Nice scenery, didn't care much for the story there)
Nar Shaddaa - 7 (Pretty cool story, feels like a poor man's Coruscant)
Tatooine - 8 (Wasn't all that fun until I got to then dune sea, then it became epic)
Alderaan - 5 (Hate the story here, pretty nice environment)
Taris - 4 (Hate the story a little less, hate the environment way more)
Quesh - 5 (Basically a more sucky Nal Hutta)
Hoth - 9 (Love the story and all the icy plains)
Belsavis - 6 (Story was all right, hate the environment)
Voss - 10 (My favorite planet, everything about this planet was epic to me)
Corellia - 7 (Best fast travel system in the game, nice story and nice city)
Ilum - 6 (Very meh, nothing compared to the wonderful Hoth imo)