1) It's in a borderlands 2 forum, and you're asking if it's good?
2) You ask a lot of questions so maybe I can sum it all up in one answer

Skins: You have the option to pick a skin/head at a QC station (in town [no spoilers]). You find more skins/heads throughout the game as loot. Sometimes, you get more for doing achievements.
Guns: Lot more guns. Some bosses/enemies drop legendaries more than others. Small spoiler: Chubby Varkid drops Bunny Rocket Launcher
Campaign: Lot of side quests, a lotttt. It's like 5 side quests everytime you finish 1 story quest. And there's more quests in each area! It's a long game, definitely something you can't beat in a single sitting. Well, you can it's just hard.
Cars: 4-person cars now (1 driver, 1 shooter, 2 people in the back)
Skills: New skills, some of the good ones from BL1 are in BL2. New action skills, new characters, etc. Lot of fun builds/skills for diversity.
Characters: 5 characters out (1 is a DLC), all legit and fun
-Axton/Roland
-Maya/Lilith
-Zero/Mordecai (Not exactly, but similar)
-Salvador/Brick
Overall, Borderlands 2 is pretty freaking awesome. Almost beat the 2nd playthrough, and still not really bored of it yet!