Sonic3 is even worse, and I made a review that points out the very same problems you've noted. It is here: http://www.mobygames.com/game/wii/sonic-the-hedgehog-3/reviews/reviewerId,109381/
I am completely convinced that this game ain't that special. And I thought it looked odd when I first saw it announced. Strange thing is, most sites are giving it higher scores...
Why GTA:CW tanked? I.think you're over-thinking it, Gamesradar. The real reason I say is because it was TOP-VIEW. No one wants to play GTA from above anymore. Rockstar got over confident.
Also, shopping for items is a pain the a** in this game too. But it has it's moments of satisfaction, like when you finally beat a massive, annoying boss.