@dylans
You have already granted that the 2007 Cavs weren't very good (likely a lottery team without Lebron), so let's talk about his Miami teams.
The 2011 team should have beaten the Mavs. Absolutely should have done it. He won in 2012 and 2013. In 2014, they went up against the Spurs, a team with three future HOF players, a HOF coach, and young Kawhi Leonard. I can't find a similarly talented team that Jordan went up against. 1991 Lakers maybe, but they didn't have the elite young player to go along with their HOF level players, and Pat Riley was no longer coaching in LA by then. There's no way any of the other teams Jordan's squads defeated would measure up to that Spurs team.
In 2015, yes, Love and Irving were on the roster, but Love got hurt in the first round and missed the remainder of the playoffs, and Irving was injured near the end of Game 1 of the Finals, missing the rest of the series. That's like taking Pippen and Rodman off those Bulls squads, then seeing if they can knock off the Jazz or Sonics.
In 2016, Cleveland was healthy and they won the whole thing.
Basically, Lebron plus any sort of talent gets you to the Finals, and, unless he clashes with HOF level talent once there, his team is probably winning.
Pick any player in history. Lebron can guard that guy. Pick any basketball skill. Lebron does it at an above average level at a minimum.
Let's take Lebron's stats this year. Leaguewide 2FG% is a shade over 50%. Lebron is at 61%. That is not a misprint. 61% on 2pt shots.
Leaguewide 3pt% is 35.8%. Lebron is at 36.3% He rebounds well. He defends. He passes. In the Finals last year, here are Lebron's lines for the last three games, all must win situations for Cleveland:
Game 5 - 41 points, 16 rebounds, 7 assists
Game 6 - 41 points, 8 rebounds, 11 assists
Game 7 - 27 points, 11 rebounds, 11 assists, also possibly the greatest (or at least the most iconic) chasedown block in history.
Those numbers are insane. Lebron's averages for the series - 29.7 points, 11.3 rebounds, 8.9 assists, 2.6 steals, 2.3 blocks, 49.4% from the field, 37.1% from three, led both teams in all five major statistical categories. That is nuts. And the thing is that those averages are a shade off the 35.8/13.3/8.8 that he tossed up in 2015 with a lacking supporting cast. Every year from 2012 on, the Finals MVP has either been Lebron James or the guy that guarded Lebron James. That's how important he is on the floor. He forces the guy guarding him to be a star.