So after dumping 50+ into RDR2 and 15+ hours into online here is my opinion.
While most AAA titles offer great multiplayer and average single player rockstar have completely flipped it.
The single player is very good (there are a few large issues i have) and is something you can easily pick it up a couple of weeks later and continue off easily.
As for the multiplayer..... well its terrible, terrible economy, medicore missions, and the small issues in single player are amplified massively online.
And the sessions are broken (i have been in 3 different sessions in a row where everyone was in the same spawn region and it was always a massacre)
Overall review:
Singleplayer: 8/10
Online: 4/10
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The economy for online is like it is because $$$. Though to be completely honest, I think they just quickly put random prices for stuff because some things seem priced reasonably like ammo and such, but looting gives you a fraction of what it did in the single player, but hunting is the same. Selling animal stuff can get you more than doing main missions.