azzaman333
meh
The correct answer for me is, "I don't know" because I haven't played Civ5 (beyond the demo). I did consider buying it at 75% off last night, but then considered that's without any of the DLC, and without the upcoming expansion, which, if it follows Civ4's pattern, will make it a lot better. As the so-so experience of Civ4 Vanilla soured me on that iteration for years, I suspect Vanilla Civ5 would do the same. But, I haven't played it, so I can't say definitively.
Overall, I prefer Civ3 to Civ4. But Civ4 BTS is a lot closer to Civ3 Conquests than Civ4 Vanilla was to Civ3 Vanilla. Had I waited until BTS was out to play Civ4, I might have actually preferred it to Civ3.
You could've bought Civ5 + All/Most (I have no idea which) DLC for about $25US yesterday.