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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I'd give it some time. While it may be ass now, Rockstar has a habit of sticking by what they make. Take GTA Online. Complete cluster-blam!- on release, but became a fantastic, highly enjoyable game after some patching and content updates.