As of this moment, I'd say I do. I joined both Spartacus and GoT late, so followed neither from the start, but did watch Spartacus long before GoT. So the fact I started watching it earlier could be the reason.
As for a notch above cheap soft core porn, okay. My impression was a mostly realistic representation of Rome, the Ludus, the slavery etc. I especially thought the fact that they managed to create a show with great tension and drama at moments even though the vast majority of people already know the outcome, due to Spartacus's story being so famous, is fantastic. Granted that many people will have read Game of Thrones before watching the show, but I reckon it's safe to say more people know the full story of Spartacus over A Song of Ice and Fire.
I had more heart pounding moments of suspense like "How on earth does Spartacus survive this, I could've sworn he freed the slaves?" than I had in Game of Thrones. I'd say the most heart pounding, edge of seat moment I had was the end of Episode 9.