I don't count online add-ons a few bikes,cars,some repeatable missions that's not really what I got it for, gta was known for massive expansions and deep single-player experiences, it was only until gta online took off and the bullshyt shark cards that they stopped giving a fukk about single player apparently. if they aren't going to make single player content and just live off online the initial price should drop.
it's good content if you want online things, but if you want story it's kind of useless, and now with them realizing they can make wayyyy more money with simple online add-ons single player in the future will likely continue taking hits in favor of multiplayer which is cool if they add actual story related content to make it worthwhile.