Lakers did not play bad, they just have chemistry issues for now because there are three players who build their whole careers out of being the main ball handler and then passing out. Lebron, Westbrook and Rondo. Rondo and Westbrook could play at different times, that can be arranged, but Westbrook and Lebron will need to learn to play together, which may take some time.
I still believe that they are by far the best team in the league right now. I know they are old, but they are also old but great players, not like they are bad now, sure most of them are beyond their peak nowadays but they are still playing like they are the best and that is what matters the most. I believe unless some big injuries happen, Lakers will cruise to 1st seed and championship.
IMO, they are bad based on what they showed in the last game, yes, I believe that the main problem is the chemistry, they haven't built effective game chemistry yet so it's right that we should not easily assume that they'll win a championship together as they still have to fix that main problem.
Westbrook and Lebron are both main scorers on their team, they love to hold the ball most of the time and that is something they need to sort out to make their respective positive be as effective as expected. Anyway, preseason is still preseason, the real battle is in the regular season, so it's still early to make a judgment.