LeBron was brilliant in that series, but I think it's silly to claim that he needed to win a ring to cement his name alongside the all-time greats. The fact that it took LeBron nine years to win a ring takes nothing away from his individual greatness, and does nothing more than re-enforce the age-old hypothesis that a great team wins out over a great player.
LeBron's always been a great player, the difference between this year and years past is that this is his first time playing on a great team. Unlike his days in Cleveland, LeBron had two guys by his side he felt comfortable penciling in for 20+ a night. Oftentimes, LeBron had to manufacture points for his teammates beause there was really nobody else on those teams who could consistently create for themselves. Even the best players only control 20-25% of the action on the court, if that. Anybody who has the nerve to assess the Cavs-Magic 2009 series (in which LBJ averaged 38-8-8 on 49% shooting) and claim that LeBron played like anything less than a champion deserves to have their analyist hat revoked, period. Even during the 2010 Boston series, when people claimed he quit, LeBron put fourth some heroic efforts. These were instances of LeBron's teammates failing him in the aspects of the game he could not control. I don't think there has ever been an example in which a team who was thoroughly outclassed at three of the five positions (like Cleveland was against Boston in 2010) managed to win the series. Yet, people still condemn him for leaving Cleveland and putting himself in a better position to win a ring.
Kobe Bryant, arguably one of the ten greatest to ever play the game, wouldn't have had enough around him to get past the second round on some of those Cleveland teams, in my opinion. It's a testament to LeBron's overall body of greatness that he managed to haul a shoddy supporting cast at best to two eastern conference finals and an NBA finals appearance.
In regards to Harden, one bad series isn't enough to completely minimize my opinion of him as a player. He hasn't been consistent enough to be labeled one of the best 20-25 players in the league, but at age 22, he's shown enough flashes of greatness to be fairly considered a max contract type player.