I fail to see how this game is broken, buggy or unplayable (according to other reviewers, they almost always had issues with this game). This game sure has aged a lot, but it still has the unique feel and setting that isn't present in any other game (even the Witcher, which is also heavily based on Slavic mythology).
Of course, it is very dated. Graphics may be ugly (but seriously, what do you expect from a game made in 2003?) if you compare this game to other, more modern ones. This game doesn't support any other display modes but letterbox (4:3). But since I'm not that kind of a guy who pays attention to graphics, it doesn't really bother me. The game's interface and controls are very intuitive and easy to learn, so both hardcore and "casual" (no pun intended) players can, IMO, enjoy it, provided that dated graphics won't distract them. I know I enjoy this game, and I've been a gamer since I was born. That's 19 years of experience.
It has RPG and RTS modes, but they aren't very advanced (that is not a flaw to me, though). It also has a built-in editor - the kind that is fairly easy to learn to use - which allows you to create and share custom content. The possibilities are endless. Even if you are too lazy to make your own stuff, you can still look for some fan-made content on the Internet.
This game has its' flaws, of course. It is not perfect. There are more complex RPGs and RTSs out there. There are games with prettier graphics. But since I am the kind of a guy who likes games that are simple to learn and present you with something challenging (not the gameplay, but the setting and/or story), I actually like this game.
Personal rating: 7/10.