Mount and Blade: Warband
It may look like an RTS from some pictures, but that's only for travelling. Everything else, ingame battles and travelling around cities is all in 3rd or 1st person.
And Warband, unlike the original, has online play.
It's medieval, and there's nothing fantasy in it. Just steel and wood weapons. No fairies, orcs, or dragons. Only horses.
Personally, I've always loved Mount and Blade, even since before it was actually put out for sale.