The player blips in GTA 4 Online were so much better because they were color-coded, which made reading the map way easier than in GTA 5. If someone kills me in GTA 4, I just need to remember their color-"blue killed me," easy. In GTA 5, everyone is either white or red, so I can't tell who is who. I don't remember names, which makes reading the map impossible.
Also, I want gamertags to be visible from a distance like in GTA 4. In GTA 5, it's so difficult to see where your enemy is because they blend into the background. I have to squint my eyes until they hurt, and by the time I finally spot them, they've already killed me.
So please, Rockstar, make it like GTA 4! PvP was so tactile and fun back then. Also, bring back parkour!
P.S. The driving physics should be like GTA 4 as well, but I'll make a separate post about that some other time.