Gothic 2 is very similar to Gothic, in fact it picks up only two weeks after the first ended. There have been a lot of improvements to the control scheme, and graphically it's prettier to look at. It still suffers from some of the same issues, namely that the leveling curve is incredibly steep. You'll find yourself being killed by flies for the first few levels, hemmed in by monsters on all sides. By the later levels you'll be a walking death machine, destroying all in your path with a gesture, until the final boss battle. Also the voice acting ranges from decent to laughably bad.
That being said, Gothic 2 is a great RPS. The various guilds and factions you can join, and the nearly unlimited freedom you have as to which direction you want to go as a character means that the game has a lot of replayability. Even in the first town you'll be confronted with a huge amount of quests and characters to interact with. If you liked Gothic by all means, give this one a go.