Gothic is awesome. Very underrated among the general public, which is to be expected since it's from a European company and didn't have much marketing/name recognition behind it, but sadly, also underrated here at the Codex. On the top 70 list, it is a mere 26, when in reality, it should be in the top 10 alongside its sequel. It's a bit less polished and smaller than Gothic 2 + NotR, but in return, it has the better atmosphere and gameworld. Being stuck in a prison colony is brilliant, and who can forget walking into the Old Camp for the first time, its giant gates welcoming you into its warm run-down outer slums that look more real and lived-in than any other RPG settlement. The first time you heard a Shadowbeast in the dark woods, ran into an orc (and reloaded), watched some guy piss behind his hut, or several guys sitting around a campfire...
This game showed how to properly do open world RPGs and shamed Bethesda into borrowing many of their ideas (and still failing to implement them properly). It just did so many things so well. It's one of the very few RPGs to implement a decent action combat system. It had amazing exploration because of the combination of open world and unique hand-placed content. Graphics were great for the time, and they made a lot of great decisions, like for example, going for simple, stripped down interiors, which allowed them to seamlessly load them and avoid the constant loading screens of Bethesda games. The faction system was great as well, and to this day, there isn't an RPG that lets you "feel" being a part of some faction in the way that Gothic did. The great NPC scripting that made the world come so alive. One of the first games to have full voice-overs of dialogue, which some people here might criticize, but it added a lot to the atmosphere and "realness" of the world.
If you haven't played it yet, slap yourself and go play it NAO!