The game Grounded almost has that feel, but it's open world.

There's another game called Hypercharge:Unboxed that is definitely giving me the feeling of those old UT maps, but I haven't actually played it.

Having a match grind to a halt because literally everyone on the server was standing in the livingroom staring at the tv...

Sniping people in the bathtub from the sink was so fun...

de_rats and similar in CS1.6