It's a usability nightmare for me. I sure love it when I open a PowerShell prompt, and some random window takes focus instead for no reason. Or when I create a new folder in Explorer, and the address bar inexplicably steals focus.
And that right-click menu can take a long walk off a short pier
BattleTanx is extremely naff, but I always have a good time with it. I grew up with the PlayStation version, which runs ridiculously slowly; N64, on the other hand, feels a bit too fast!
The PC Engine is definitely a contender. Looks like something from the set of Star Trek TNG, takes unique little cards, and is extremely tiny* and compact. (particularly for a system that was ahead of its time) I think it's neat!
KRDC does a good job at RDP!