They are very good, their track record proves it.
But in the case of LA, Phil doesn't have the talent to compete against the Suns. They need to play a perfect game to win, while the Suns have a much greater margin for error.
Miami is also in trouble, because of a talent deficiency. Payton and Williams just can't cut it anymore, and Wade, Shaq, Zo and Walker aren't enough to get it done by themselves. They need someone else to step up or Chicago is going to beat them. They are now in a situation where they have to win the next two, or there defense of their title will end.