I personally have no problem with it. Learned about Buffalo Springfield in the fourth grade purely because of a the Public Enemy song "He Got Game". Hell, sure, most of them aren't done in a very tasteful manner - but you can say that for almost any cultural product where they pay homage to another cultural product. For every the Game butchering the Impressions, there's a Tupac adding to the (overall pretty shitty) legacy of a Bruce Hornsby. I can understand that Hornsby and the Impressions are two entirely different machines - however, if artists were only allowed to sample the shittier, one-hit-wonder songs, artists like the Impressions wouldn't be as highly treasured as they are today.
Part of what makes the artists great is the numerous artists who came after them, who, regardless of genre were highly influenced by them. We should be celebrating the fact that a hip-hop artist like the Game is introducing a new generation of souls to a legendary group such as the Impressions, hell, maybe they'll actually find a Curtis Mayfield record because of it. If you feel like it's butchering the original, then, perhaps you should click the 'x' button and forget that it ever happened. That's what I did with the Devlin remix of All Along the Watchtower.