Not a bad RPG, but it's hit-and-miss and could've been a whole lot better.
Graphically, the game looks like a mediocre melding of Oblivion and Gothic 3. Landscapes can be breathtaking, though the amount of plant life crammed into areas just looks downright messy at times. Trees look realistic at a distance but are a bit funny up close. Water regions are tolerable, though the textures are not up to modern standards and, as far as I can tell, are limited to the surface only (i.e. no diving). Characters look fine during regular gameplay, but conversations result in a zoomed-in cutscene-ish view that makes the artwork look like it was done ten years ago. The spell effects are very nice, but the blood effects are terrible.
The game's animations are also on the fence. For example, if you jump from a certain height with a running start, your character will engage in a beautiful full-motion leap, landing solidly and bending his knees before returning to an upright position. However, if you don't have sufficient height or attempt to jump while standing still, your guy will immediately and rather unnaturally return to a standing position with no transition animation, almost like they forgot some frames. WTF? It's quite ugly.
From a performance perspective, I have had no problems with the game, and I'm running at widescreen resolution. If nothing else, hats off to the developer for at least optimizing the engine, a luxury I kept wishing for in Gothic 3 but never received.
Audio ---- eh ... well, it's passable. Fighting sounds are generic. Magic sounds are ringy and ambient. Fire sounds like fire. Nothing special, though there's nothing that necessarily detracts from the immersion (except the lack of sound when you hit a wall or something).
The voice acting ranges from stellar to canned fantasy cheese. Fortunately, the cheese can usually be overlooked, because some of it is actually funny (even when it's not meant to be).
What I find consistently annoying is the constant stream of actors with American accents speaking in Middle English. For starters, the Middle English just sounds ridiculous, like the writers were trying too hard to reinforce the fantasy setting; I don't think even British accents could have saved the voices from this problem. Secondly, sans British accent as the voice work is, why force something like Middle English on actors who clearly are not equipped to deliver it? I would much rather hear Modern English delivered well than hear Middle English delivered poorly or with an American accent.
The gameplay itself is fairly straightforward: WASD to move, left-click and right-click to fight, E to jump and Space to use items. And everything is assignable, of course. Great, right? Wrong. Assigning skills and inventory items to hot-keys is a pain in the butt. There is no key for walking or sprinting. You can sneak for stealth, but this is hardly an efficient or realistic way of taking a stroll.
Like Oblivion, Two Worlds features horses that the player can ride, and there's the added bonus of being able to fight on horseback. Great again, right? Wrong again. Horses are nearly impossible to control. And when I say "impossible to control," I mean "don't bother." If you don't heed my warning here, you will soon find yourself utilizing four-letter words as your animal wildly runs off the road, into the open wilderness, through hapless groups of enemies waiting to murder you, finally coming to a halt once you are so far off course that you must use your map to see where your insane animal has carried you. Seriously. It's that bad. It's even worse when you do what I did and waste skill points on horseback fighting in eager anticipation before you have a horse, only to be devastated to learn of the futility later on. My advice: stay on foot. And this is depressing, because horse combat was sorely missing from Oblivion, and I had hoped Two Worlds might deliver. So much for hope.
Plot-wise, the game revolves around a mercenary (you) whose sister is kidnapped, and your main task is to find her. As expected, there are numerous side-quests with various factions, which can affect your reputation with the different groups. The map is pretty big, and there's an underground region that effectively doubles its size, so you've got plenty of ground to explore if that's your thing.
Despite the retarded problems, Two Worlds runs well, has a lot of content to offer, and is mostly fun to play. Though not the replacement for Oblivion it was hyped as, it's definitely less buggy than Gothic 3 and is worth a try if you like computer-based RPGs.