Whenever a thread like this comes up and people compplain about the setting of G1&2, G2 gets to be called a "tacked on sequel" or someting along those lines and people seriously complain about the combat, especially in 2, I quite seriously have to wonder wether we played the same games, and if so, wether they really could have lost THAT much in translation. Simply calling them action rpgs doesn't do either of them any justice - action'ish combat does not warrant that tag alone, there's just so much more to the whole experience one can have. Yes, the gothic 1 control scheme is confusing and basically a nuisance in the beginning, but it also is highly effective once one gets used to it. I can't even begin to comprehend whatever could be wrong with G2's controls. The world, again especially in G2 and it's expansion (and yes, NOTR truely expands the world, instead of indeed tacking on some content like so many other "expansions") has so many things to do, it feels like it's living and breathing. The combat is not bad at all, I believe the problem would rather be that most people can't get over the fact that the world and its inhabitants are extremely deadly to the nameless hero in the beginning and stays that way for the better part of the game. Exploring that cave or those deeper woods has you alert and will have you go from exploration mode to "Oh SHI..!" survival mode in a second more than a few times. A lot of quests have multiple solutions. G2 may be linear, but you still get that pretty open world (which just keeps opening up) to play with, not to mention that there's a good chance that most people won't care about the linearity, since it just flows in a way that feels natural and because of the brilliant way the chapter systems keeps things interesting in most, if not all locations.
I won't bother with G3, there are a lot of oppinions available already about why it is or isn't a good game. What I will say is that I believe it lost most of the core qualitys that I praised above and as such I'm not sure how happy I am about it being called a Gothic. I'm not even talking about all the technical fuckups here.
Play G1 if you feel like it, no problem if you don't. But G2+Notr is a true masterpiece and everyone who doesn't give themselves the chance to really get into it is missing out the same way someone's going to miss out if he doesn't play PS:T because he read somewhere that combat isn't all that great and there's a lot to read.
In conclusion, to all G2 haters: Go grow some nerd-balls, whipe away those "buhuhu the evil wolve killed me again
" tears and learn to appreciate this awesome game and its possibilities for what it is (see above).