Scarface: The World is Yours is really great competition for the GTA throne. It did so many things better. I loved it! It was a cool what if game, definitely.
Predator: Concrete Jungle is also great. You can use camoflage, heatvision, and voice mimic, plus much much more. It lets you skin people and dangle them from bilboards etc.. You can rip out peoples spinal columns, climb up walls, use cool weapons, change outfits, traverse large cities. Loved it.
Right now I'm playing Hulk: Ultimate Destruction after hearing about it on these forums. It's so much fun!