Majority of tenement houses along the Sienkiewicz Street
I know them, and they are in fact a bit boring.
Apartment buildings is a better name. Tenements or tenement houses is a mistranslation I've seen a few times. The term tenement usually implies slums or near slums. Where I'm from, those buildings would be considered almost modern and certainly unexceptional.
The best building on that street (you know the one) is Art Nouveau anyway. I doubt any there are worth a special visit.
Boring? Yes, for a Brit or Italian from somewhere crammed with history.
The church where I was attending masses since I was a kid is part of a Baroque
There are some quite nice baroque and more usually neo-baroque churches in Poland, though not do many historic ones compared to some other European countries. The church in my village is Norman and the one nearest to the place I call home there now is Saxon. This is quite typical there and unexceptional, whereas in Poland you would be lucky to find historical ones without a guide book and s car.
The audio guide at Malbork must be new. When I was there you had to join a very dry and dull tour for some unfathomable reason, with an old bag presenting a particular view of history.