I'd say at this point the Heat are more scared of the playoffs, then the other playoff teams are of them.
Heat have lost to Boston (2x), Orlando, Utah, New Orleans, Indiana; all contenders and/or probable playoff teams. Also throw in a loss to Memphis.
Their wins are against Philly (2x), Nets (2x), Toronto, Phoenix, Charlotte, and Orlando. All bottom of the barrel with the exception of ORL.
When the playoffs roll around their are no easy games to pad your record.