I recently played an amazing DOS game where you have your country and you can declare war or peace with other ones, and i really enjoyed it. Growing up one of my favorite DOS games was Gobliiins 3, such cool memories!
UFO: Enemy Unknown was a pretty great game for its time.
Quake 2 was insane. I remember crazy lan parties with my pals. You just had to type a simple command to launch the server (no special configuration needed) and then just launch the client on the PCs and that was it.
Point of order! Quake 2 wasn't a DOS game. I know, because I tried to run it on my Pentium 133 in DOS for the additional performance, only to be greeted with a message telling me it only ran in Windows :(
This is really interesting actually, because I was introduced to UFO/the underwater one by my dad, and he told me the opposite, that the newer games don't have the feel of the original. Should I give them a shot?
I think so. Oddly enough, I remember hating the underwater one after playing the original! They had a few games in between that I felt didn't really capture the same feeling as the original game, but I think the newer ones do it quite well. You can usually get them for cheap as they go on sale pretty frequently.