Look at the Dallas Mavericks?

I can agree they can beat almost any team. But they can also loose against almost any team. Years ago they had trouble winning games with teams over .500 , now they have difficulty winning against teams under .500. Maybe its my imagination, but its what statistics show. Except for the cleveland altlanta games. One year they make the finals the next they loose in the first round, the next they make it half way. This year it can go both ways? Whats real anymore?