greetings!
i'm a long-time reader and long-time poster in the boston globe but this is my first post here on CB. i wasn't planning on signing up but i couldn't resist chiming in on this topic:
i think it all comes down to this. LBJ is simply 2 things. he is either
1) a sellout
2) a Robin
in scenario 1: Listen, there were plenty of great destinations LBJ could have gone (Knicks w/ Amare, Bulls with Boozer/Noah/Rose/Deng/etc., Cavs) and he still would've been in a contender and he wouldn't have tarnished his legacy at all. the Cavs had been back-to-back best regular season team and they were the odds-on favorite to win it all in the East last year. so it's not like LBJ had a crap team. if anything, he had a pretty [dang] good team! you don't have the best record in the league with a crap team.
furthermore, if the Cavs had beaten us, Shaq would've given Dwight and Bynum problems. As a matter of fact, i would think that the Cavs would've beaten LA. They just ran into bad matchups with us with the emergence of Rondo and the versatility of KG.
but back to Lebron...
the fact that he joins one well-established superstar (Wade) and one wannabe-superstar (Bosh) makes him a sellout. they are proven commodities. These are 2 perennial MVP candidates joining forces in their prime. Wade was expected to sign with the Heat (he signed before LBJ's decision) and Bosh was expected to follow him anyway so there are no problems there. It's just that LBJ chose to join another player's team that makes him such a sellout. It's like him signing with the Lakers. or Boston. or the Magic. LBJ's biggest rivals are Kobe, Wade, Dwight, Melo and the "hated Celtics". These teams have the players that the greats are supposed to vanquish on their way to cementing their legacy. and for him to sign with them... that's just a sellout. imagine if during the time when Kobe's Lakers teams still sucked (with Kwame and Smush) and he just decided to join the Spurs.
in scenario 2: the other probable reason why people are upset is because LBJ was packaged/marketed in such a way that we were made to believe he was the next generation version of MJ or Bird/Magic. after all, "We are all Witnesses"

that denotes greatness. and the fact that LBJ chose to go the "easy" route shows that well, he really isn't. instead, he's a next-gen version of Pippen. a guy who's really great but not great-enough. and all this talk about how he's the King or the Chosen One propagated by him and the media suddenly makes him look like one big fraud. and no, people don't take too kindly to frauds.
so there you have it. it's either he's the next Pippen (who we can all say wasn't MJ) or he's a sellout. MJ and others trashed him and rightfully so. they're not saying he's not a great talent. i'm sure everyone recognizes that he's a terrific player. all they're saying is that don't mention their names with LBJ in the same breath. because he's not at that level and now, there's no way he can ever reach them.
- LilRip
(ps: about Barkley joining a loaded team later on in his career. that doesn't tarnish his legacy at all. if he did it in his prime like LBJ did, then it's a diff matter. but to do it at the twilight of your career ala Payton... i don't think that tarnishes anything)