Justin Bieber is finally getting some support from the NFL world -- 3-time Super Bowl champ Willie McGinest tells TMZ, Bieber is a GREAT neighbor ... despite claims by other NFL legends that the singer has a serious speeding problem.
The former Patriots linebacker -- who lives across the street from Bieber in their gated Calabasas community -- was out and about Monday when we asked about the Biebs' notorious alleged acts of neighborhood terrorism ... including allegations by ex-NFL stars Keyshawn Johnson and Eric Dickerson that Bieber's Ferrari is a dangerous menace.
But McGinest -- who left USC in 1993 just one year before Keyshawn joined the team -- says the rumors are all hype, telling us, "[Bieber's] a good neighbor. My daughters love him."
It all sounds nice -- but the fact still remains ... McGinest is pretty much the ONLY person who says Bieber's even remotely tolerable to live next to. And numbers don't lie.