Not as good as the Amiga version, but great fun nonetheless
Like (for example) Hero's Quest: So You Want To Be A Hero and Moonstone, Defender of the Crown is a triumph of atmosphere over modern considerations such as 3d graphics and cd-quality sound. The wars and intrigues of old Saxon/Norman England come to life in truly remarkable fashion, especially considering that underneath it all is a fairly straightforward strategy game. Castles can be raided, jousts held, maidens rescued, and lands seized - what more could a proud young noble want?
The PC version reflects the period when the Amiga (and Atari ST) were far superior in terms of graphics and sound. The luscious backdrops and portraits of the original don't quite have the same appeal when translated to EGA.
For the gameplay, DOTC has the annoying quality of severely punishing mistakes -put one foot wrong at any point and you'll likely lose the game within two turns. Getting in front and staying there is paramount; it's extremely difficult to come from behind and win. Further, the combat is nastily arbitrary; the "tactics" options when raiding a castle have little or no effect, and you'll frequently find a battle unwinnable regardless of the size of your forces.
The Bottom Line
If you want an object lesson in why old games are still good, play DOTC. It shows that atmosphere and playability are NOT functions of how fast your computer is or what graphics chip sits inside. To be still enjoyable after all this time is a remarkable feat - how many steroid-frame-rate games of today will be around in fifteen years?