Gothic was MUCH better than Risen for its time, and even if you compare them directly, I agree Gothic is a little better.
I also agree with your criticism of the late-game balance. There were far too many permanent stat potions in the last 2 chapters. I remember playing as a mage and still being able wield the strongest two-handed weapons because of all the stat boosts from potions and rings.
I envy you right now. I wish I had the spare time to do a replay of that entire series. (minus Arcania)