In the games that I've seen the Lakers play--- in 4th quarter crunch time, Kobe starts jacking up contested 3-ptrs and forgetting team basketball. That has been the Lakers story since Shaq left, and it still is the story.
Also, there is a reason that Gasol has never performed well under pressure. His main move to the basket is only effective against weaker opponents who are giving him a little space, and a determined defender can keep him out of position. I seem to remember Oberto having some success against Gasol in the past.
On the other hand, there are reasons to consider the Lakers a serious contender. In my mind the #1 would be Phil Jackson. Say what you want, but the guy has 9 rings. Compared to D'Antoni, Flip Saunders, Adelman, and other coaches who have never proved they can lead a team to a championship, Jackson can not be dismissed. One of the other Lakers strengths is that they do have good depth and bench player, which is one thing Phoenix always lacked.