My review title says it all. Two Worlds is like Divine Divinity because there is no class system and you can develop your character anyway you see fit. The game is like Gothic because, although customable like Divine Divinity, your sex is limited to a male character, has a gritty, unfriendly world, and is in third person behind your back view. Two Worlds is like Diablo from an action rpg perspective, you can increase your main stats: strength, intelliegence, and there is lots of loot, but not as creative as Diablo.
What else can you do? You can make potions, cast spells, customize your spells to be more powerful, use less mana, etc, customize weapons to do more damage, such as fire, cold, etc., summon monsters to aid you in battle, use high damaging traps, ride a horse, fight from horse back (unlike Oblivion)... I probably forgot something.
The game's weakness is definitely the voice acting. A lot of reviewers compare this to Oblivion, and this is true from a graphical standpoint only.
Two Worlds is definitely entertaining, but I eventually found myself replaying Oblivion. Oblivion has better more fleshed out quests than Two Worlds and a better game world in general. If you have Oblivion and played it to death, than Two Worlds is definitely worth a gander.
It is more of a B list game, than A list game like Oblivion.