I completely agree that Gothic 3 needs work to make it playable- but I do not agree that Gothic 1 & 2 are unplayable messes (not to argue that unofficial patches and add-ons are at all a bad thing!).
Pretty sure the 1.08k patches for G1 and the 2.6/7 patches for G2 are *third party patches*. I think GOG includes both patches in its versions of the games, although I can't recall exactly atm. On my Win10x64 system I can't get either game to run without those patches, and, very importantly, the System Pack patches, as well. Yes, G3 at ver 1.6 was an abandoned and unplayable, buggy mess, imo. I bought all three games when new. I owned the Steam version of G2 (long after I lost my original G2 Cds somehow) before I bought the GOG version--and I could not even get it to run without the 2.7/6 community patch. 2.6 is recommended for the latest patches and mods.
There is nothing like playing G1 and G2 at 2560x1440 in Win10x64--with texture-patch enhancements, and so on. Perhaps where we are disagreeing in is your definition of "playable"...;) The games now play better and are more configurable and much better looking than they ever were when PB abandoned them--but I have to give the credit to mods, especially the D3d11 mod for G2 and G1, the patches and system packs. I would not advise anyone to even consider playing G1 and G2 without using these patches--the D3d11 mod is especially beautiful on my Rx-480 8GB gpu.
Properly patched with texture mods--and I can highly recommend the d3d11 mod for D3d--I would not play these games ever again without them--G1 and G2 are really a lot of fun even today. I highly recommend both. The Community patched G3 game (1.75.14) is the *only* way to play this game as well.