Rondo is easily a top 5 PG in this league. The only other PGs in this league that I think people can say they have a better all around game than Rondo is Paul, Williams and Rose in that order.
Westbrook isn't a great defender and is way too much about his offense than anyone else's. He's not better than Rondo.
Nash is too old and plays no defense.
Kidd is too old and can't guard PGs anymore.
Parker has seen his game slowly become less and less and is injury prone.
Curry doesn't have the defensive or passing or ball handling or floor general abilities that Rondo does.
Wall is so inexperienced and his game very very raw. He is not in Rondo's league yet but could be.
Jennings, well that's just a joke.
For the record, I wasn't necessarily arguing that the players I mentioned are all better than Rondo right now. The point is that there are a lot of very good young point guards in the league right now, and most of them have a higher ceiling than Rondo -- in my opinion.
Unless he really changes his offensive game, I think Rondo is more or less at his ceiling, and I'm not certain how long he can remain a high impact player given his style of play (once his speed / athleticism goes, I'm not sure what will be left).
When Rondo was healthy this year he was playing as well as any point guard in the league. I'd call that his ceiling, unless ceiling somehow means a lower level than you've demonstrated the ability to play. And aside from the fact that Rondo's probably 6-7 years from starting to lose his speed, that's not the biggest part of his game. His knowledge of the game, vision, passing ability, the way he runs an offense, all of which are exceptional, all are more important.
Early in the season when Rondo was racking up 15 assists per game, yes, he was playing as well as any point guard in the league.
But that kind of APG average was not sustainable, even with all the weapons Rondo had available.
Just as you keep arguing regarding Chris Paul, you have to look at the whole season as a body of work, not just select portions of it. While Rondo has the ability to play very, very well for stretches of time, whether it's dominating a few games in a row to win a series or racking up a record number of assists to start the season, he doesn't have it in him to play at that level all of the time, or even most of the time.
In other words, while Rondo is a very good player, he isn't a superstar. He's not a guy who can carry your team, or even a player that you ought to build a team around.
As I have said many times, I have a great deal of respect for what Rondo can do as a player, but I think it's important to recognize what he can and cannot do, and have reasonable expectations. Being a great two way player who can be the guy for a top team night in and night out is just not something he can do, at least as far as he's shown so far. This puts him solidly behind players like Deron Williams, Chris Paul, Derrick Rose, and yes, even Steve Nash.
Players like Wall, Curry, Evans, and Jennings are not yet even on Rondo's level, but because they have more all-around games they have the potential to one day pass him as well.