Smeatza said:
As characters Michael and Trevor are interesting and a lot of fun. Franklin is okay.
It's their stories that are a bit crap.
That's about how I would sum up my opinion, I've been thinking about why I loved their characters but found the overall GTA V story to be lukewarm.
Michael, Trevor, and Franklin are well written, insofar as they have really snappy lines, hilarious dialogue, and their interactions with each other and other characters are also entertaining. It's just the actual story arc of the game that doesn't do anything for me. As Yahtzee stated, they don't seem to have any consistent motivations, and the motivations they do show will change at the drop of the hat to suit the scene. Admittedly, this is probably partially because the game tries to focus on all 3 characters, it just doesn't spend a ton of time developing any of them, so we're left with something closer to a 3 stooges movie, with the 3 main character only serving to set up the comedy in each individual scene, rather than trying to weave everything together into an interesting whole.
Franklin is basically CJ without the gang loyalty, and spends the whole game wrestling with that tired old cliche of, "I want to make something of myself, but I'm trapped in the hood". We see Franklin get money and basically get out of the hood, but nobody else, least of all Franklin, really reacts to this. He gets his new place and new life, and all we get in reaction to it is a text message from his aunt and a call from Lamar, if Franklin had been the only character we would have gotten a few missions where we see Franklin struggling with trying to cut his old connections and maintaining his new ones. As it exists now all we get is one scene where the old flame we've never seen until she shows up to have us rescue Lamar, and that's it one mission and Franklin has one conversation about choosing between his dreams of wealth and his homies (which is pretty much only Lamar). The ending fleshes him out a bit more, but his overall motivations and character seem to change depending on what ending you pick.
Michael seems to have the most character development, but even then it gets truncated so we can focus more on Franklin and Trevor. The arc with his family leaving and coming back is probably the most interesting bit of story, beyond the massive chunk of the game where your just doing different errands for various douchebags. Even then though, michael loses his family and gains them back over the course of 2 missions, he also gets them back seemingly just so they can be threatened and provide the motivation for two of the ending choices. His fallout with Trevor is also pretty shallow, after he's rescued, Michael and Trevor just seem to whine at each other, although this is partially due to Trevor's wildly inconsistent character.
Trevor himself is hilarious, but his scenes and story are 90% pointless. Just when it looks like we might get some legitimate confrontation between him and Michael, they immediately go to making snarky comments to each other, so they can get their big job out of the way and usher in the abrupt ending. The game spends too long just having you do random missions for the FIB and the billionaire douche, by the time the story decides to move anywhere, its got to do it for 3 different characters, and it just doesn't have the time to make any of the 3 of them anything beyond characters for an individual scene rather than the story as a whole.