Here's how I feel.
I grew up with the original song. That Isley Brothers song was and still is a classic amongst classics. One of the greatest R&B songs of all times.
Some songs should just be left alone. Tupac's version ruins the original song. The drums are awkward over the sample. Master Ace's version is cool but it still ruins the original song.
Nas's version was cool because he didn't alter the beat too much.
When its all said and done, I'd say none of the above. They should have left that song alone and picked another beat.