LeBron James is going to SERIOUSLY regret buying his daughter that big-ass playhouse ... so says Brandon Marshall, who claims the whole thing is "the worst investment ever!!!"
Don't get it twisted ... the ex-NFL star loves the sentiment behind the King's gift to his 5-year-old -- he just says he knows from personal experience the mini-mansion ain't worth it!!!
"I actually, in 2015, bought my twins a house similar to this," Marshall said on FS1's "First Things First" on Wednesday. "And I'm embarrassed to say how much it cost me."
"And then the upkeep on it was as much as it was taking care of my own house!