Well, in a way, it was useful for youI printed sulla's opinion out and used it to line my bird cage.

To each their own. At least I don't pretend civ V is crap in absolute, I jsut say I think it is. Civ V is inferior to IV for me in every aspect except having hexagons. Everything else is a regression. The religion system is likely better, but not part of the base game, and yes that matters to me, as I'm not buying expansions of a game that should have pleasedme without expansions but didn't. Plus they don't change the sruff that is broken/unfun for me in the base game.Since Civ5 is by far the best and outclasses civ4 in every aspect , I'd say you can't regret playing civ5 for two months. And I was a fan of civ4 (and 3 ,2,1 )...when it was its time that i , I hopefully didn't get stuck with no valid reason
People point out that civ V is more successful than IV, but when you see advice like this one, it doesn't mean it's actually better liked by those who played both.
So, to the OP, imo bide your time. It looks more likely that you'll like VI over V since it seems to have learnt/fixed some issues, so there's really no point buying a game until you can't wait a few months.