How were Gothic characters any more than cardboard cut-outs? You basically had Germanic muscle-men walking around going hurr durr and handing out quests. In fact, I don't think Don Esteban or the Inquisitor were particularly great characters, but do just fine when compared with Xardas, etc. Moreover, every single PB game basically gets worse and worse in the second half of the game - chasing down the dragons in G2 NOTR was excruciating just like Risen endgame is a monsterfest.
I won't argue the originality of Gothic characters over Risen characters, but in Risen the NPCs never felt like more than set pieces. True, the Gothic games also had their fair share of pretty unimportant NPCs, but on the whole their cast is more memorable than Risen's. Not necessarily because Gothic NPCs are more original (as I said, not arguing that), but because they don't exist in a vaccum. Compare for example the hunter sawing logs at the entrance of Risen's bandit camp with Diego, Gorn and Lester in Gothic 1, Lares in Gothic 2 or the mercenaries at Onar's farm. He tells you a little about the camp, gives you a quest and after solving it heads off for the swamp, never ever reacting to any of the events in the game to come. In the colony, the guys showing you the ropes of their respecting camps become long-lasting allies, later helping with your search for the foci. The mercenaries at Onar's farm later split up, some joining the dragon hunters, some staying behind, informing you of recent events or being involved in some new quests. They are actually involved in events, even if at times only superficially. In Risen, it's as if every NPC save a rare few exceptions like Patty exists in isolation.
Which is also one of the reasons why the game world felt so sterile and empty to me in later chapters. Yes, of course, PB games always devolve into 'Hunt the MacGuffin'-quests in later chapters, but like I said, in Gothic the NPCs reacted to changes in the game world or even caused them themselves; the old camp shuts down, the mercenaries split up, dragon hunters start to roam the colony. New enemies spawned everywhere, so the world didn't become devoid of monsters and animals by the second chapter.
Again, I'm not saying the Gothic games were unassailably perfect or that Risen sucked. I'm saying that Risen did notably worse than the first Gothic games in areas that are the strength of PB games.