I didn't say we improved, I said we did enough to stay better than the Lakers.
Unless the Lakers youngsters improve dramatically over last year, which is possible, the Mavs are the better team right now. With their lineup, if Dirk's age doesn't catch up to him all at once, they will likely be battling for the 7 or 8 spot in the West. For the Lakers, getting to 30-35 wins is likely the ceiling given their youth.
However, at this point, the Lakers look to have the better future.
End of the day, it doesn't really matter which team is better right now, since neither is sniffing anything close to a title.