having 2 legit 7-footers who are very capable both on defense and offense is pretty good. plus, having Odom off the bench is huge for them because he's as skilled as they come. they're not overrated. they present matchup problems.
the Thunder gave them problems but do you know what play did the Thunder in? Yup, that crucial putback by Gasol. And we were close to winning the championship in game 7 but you know what was the ultimate difference? about a bajillion offensive rebounds. In that 7-game series, whoever won the game was the one who won the boards. their size poses a problem.
i'm sure it's always part of the gameplan to "limit the Lakers' offensive possessions" but that's a lot easier said than done. i'm sure in our case, other teams' gameplan is to "not turn the ball over" because Rondo plays a perfect transition game and our shooters get open a lot on delayed transition, but goshdarnit, doesn't Rondo just mess their gameplan up? 
The size had nothing to do with that Gasol tip. Just a great heads up play. It was the Thunder's failure to execute offensively when it mattered. They were so close to win two times on the Lakers home court, but failed cause of inexperience
And for Game 7, it wasn't even about the rebounding. The score was like 83-79, so all of those offensive rebounds hardly translated into points. It was the Celtics failure to execute on the offensive end. Which is why the Perk trade made us alot better. Up by 13 but couldn't hold the lead. Stagnation killed us, not rebounding
wait a minute. getting killed on the glass 53-40, while allowing them to get 23 offensive rebounds didn't make a difference??? The Celtics were playing as great D as you could ask them (plus Kobe throwing up inefficient hero shots) and we held them to a miserable 32.5% FG shooting. We should've won.
...but we didn't.
i never watched the game again, because i hate it, but i know Gasol got one of his huge offensive rebounds with the game hanging in the balance, under a minute to go. our defense can make teams do things they don't want, and force up shots they don't want to shoot, but what makes the Lakers formidable is that their bigs can help erase those mistakes when they crash the glass.
size is something LA has going for them. To quote you, "
Obviously another big would've helped" and isn't that the whole point?? that LA has good bigs and no matter how many Shelden Williams you throw at them, it's not gonna work because you actually need quality bigs? Not injured ones (JO, Perk)? and not scrub ones (Shelden Williams)?
if they traded Gasol to get a guy like Rashard Lewis (y'know, a non-rebounding "big"), every other team would love that trade because it takes the size away from LA. Bynum is a huge luxury for them because it allows Odom to come off the bench. Let's face it, despite Odom's inconsistencies, he is a quality starting piece for 28 other teams (BOS and LA being the exception) playing either the 3 or 4.
hate the Lakers but u gotta call a spade, a spade. they're beatable, but size is something that is definitely an asset to them. It's not some sort of imaginary thing that ESPN, among others, hypes up for no good reason.