I think you're a bit to close to the film to be free of bias.

For all of its cinematic value (if any), Scarface is a bloody, violent film of a drug-running killer. It features the aforementioned chain-saw scene, the point-black killing of the Columbian drug dealer, the Uzi scene in the club, the final solution with Mel and Frank, the murder of Sosa's right hand man during the failed assassination, and the end where Tony's guts get blown all over the nice carpet.

I think it deserves the praise it gets, but it also is an extremely violent movie, even for its time, in my humble opinion. Most of the problems with Scarface today is that it has been adopted by the ghetto-gangsta-thug rappers as some sort of self-appointed autobiography and ideal.