OP here -- I don't love any airports, but I've always found TXL fine as far as they go. Old, old fashioned, but often much faster for it, and very nicely close to my destinations in the city. Arrivals there are fine. Perhaps a little more delay than usual, recently, getting bags, but not more than other destinations in my experience. Can get crowded if they're running behind because each gate or two has tiny baggage claim area, but fine.

Departure also fine in my experience.

Things I think it would be worse for:

* Transfers (I wouldn't think transfer through there very common, since I hadn't thought it was anything like a hub, but I don't know; I have never done it), since I would think you would always have to reclear security.

* Passing a long waiting time.