At the moment, I'm mainly playing Dark Souls: Remastered. I've been playing at least six hours of it every day since it came out in late May.
The first Dark Souls was my favorite in the entire Souls series, and I've clocked a good 500+ hours between Dark Souls: Prepare to Die Edition, and this latest version. I've beaten it dozens of times already, and yet it somehow still never gets boring for me. There are so many ways of playing it, so many new builds to try out, and use items and weapons I've never used before. Not to mention it's always exciting getting into some PvP.
Dark Souls is probably my favorite game of all time.