Consoles would be a 7 and PC gets an 8 strictly for the loading speeds. I played it on XB recently and got damn like 80% of the online experience is loading. PC more than halves the time. Other than that online is great.
Story mode is eh, seems like they had story mode seriously be about the story. Characters aren't as fleshed out outside of Michael. The pacing is faster not having some events soak in.
The NPC drivers are horrible. They are pretty much oblivious of the player. Speaking of, they got the nice mix of arcade and GTA4 driving realism down. They should have the Midnight Club team turn the driving into a subgame. Modding cars should have a more noticable effect on cars.
IDK, with SP DLC it would be better in terms of story arc. Franklin fell off early in the game and the Michael-Trevor story was too railed. Online needs longer jobs/more heists.
At it's core I think it's better than 4, cuz 4 felt like a high def last-trilogy game. 5 feels like the generation jump. But the story is much weaker. Everything is good. Online mode, animations, graphics, shooting mechanic, the driving, and so on.