FPSes are cool in the US because of how we glorify our victories in WW2 and the Persian Gulf. I'd imagine it might be opposite in Germany for the same reason.
This is true in board games. German board games rarely involve combat or taking over territory. Where there are lots of classic American board games with these themes.
- Anno Series (I just picked up Anno 1800 yesterday)
- Fugger / The Guild 1-3 / Patrician etc
- The Settlers / Die Siedler
- Games set in the Dark Eye (role playing framework similar to D&D but more popular in Germany) universe.