I'm actually quite surprised this hasn't been an issue with other people. Okay, I'm not questioning people who think otherwise, but I have a serious issue with motorcycle physics in GTA V. I'm pretty much fine with the car physics, they haven't been a problem for me. However, the motorcycle physics feel very wrong, even for a GTA game. It's not so much the handling itself that bothers me, it feels alot like most 3D Era games like cars do. What I don't like however, everything else.
For a start, doing wheelies is completely broken. You have a better chance at doing them at slow speeds, but attempting them at faster speeds is completely useless, no matter how hard you hold the stick down. You bike will tilt slightly upwards and that's about it. It feels really stiff as well, not being able to turn while in the progress of a wheelie, unlike GTA IV and other games.
And then there's the drifting. Well it's not so much drifting as it is just doing a sharper normal turn. This is very evident on bikes like the Sanchez and PCJ 600. Bikes like the Vader and Nemesis are somewhat better at doing drifts, but that's not saying much. Choppers aren't ideal bikes for drifting though even then it could be better. Because of these lousy drifts, no longer can you do a cool 180 degree turn followed by a wheelie anymore. Did I also mention how holding down the drift/brake button does not leave skidmarks like it used to? This seems to show that there was never even an attempt at this mechanic to begin with. Even Chinatown Wars has better bike drifting.
Other gripes I have is how easy it is to get knocked off (especially by slight bumps from pursuing police cars) eventually leading to certain death, and a rather annoying camera that moves around too much. Aside from the aggressive wanted system and lack of interiors, I've not had a whole load of major issues with the game, but this is definitely something that Rockstar dropped the ball on. I don't know how they could mess it up so easily.
This is not a thread to bitch and attack the game. I know people may disagree with me and that's fine. This is just to discuss the motorcycle physics. I think this is one mechanic Rockstar should consider reworking and patching.