Total rebounds aren't a real indication, but
defensive rebounding is better.
http://sports.yahoo.com/nba/stats/b...team&conference=NBA&year=season_2010&sort=242
Certainly, looking at it from a regular season total stand point, it would seem that rebounding isn't important, but when you look at the past teams in the ECF/WCF, or finals itself, rebounding is a huge factor in who controls the pace of the game. Giving the opposing team one shot opportunities limits their possessions and gives you a chance to run offense against any opposing defense without it being set.
What's the point of limiting easy shots at the rim when you don't finish the possession with a rebound? So a team shoots 43%; it'll look like nothing if they get extra possessions or easy putbacks. That's one of the main reasons why the Celtics lost game 7.
http://espn.go.com/nba/boxscore?gameId=300617013
The Lakers shot worse in pretty much all areas, but were so huge on both sides of the boards that it didn't matter if the Celtics played better defense. They simply couldn't finish out the possessions in the fourth quarter (I guess you technically could consider Perkins' injury a lucky break.. fine).
Try to look at the past few championships (00s and 90s) and find not one big men that at least dominated the boards (usually, there are two, but sometimes there has only been one).
If the Lakers length and big men didn't matter, I'm sure the Thunder wouldn't have gone out of there way to sign two big men or the Mavs to get Chandler, or the Celtics to sign two centers (even though they're doing some stupid stuff now IMO), or the Heat to get Dampier.