If you still haven't played any of the King's Bounty you now have the chance to do so as GOG is selling the four most recent games of the series in a new bundle for $20.
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I also loved the first 2 KBs. The third one, not so much. It was buggy, felt like it didn't change much of the gameplay, and it was too long for my taste. I've been debating on trying this last one, but if it's more like the third and not so much like the 1st and 2nd, I think I'm going to pass, $5 or not. It also doesn't look very different from the previous ones except for you being 'evil', but from the screenshots I see the same units, spells, etc.I love the Kings Bounty series.
The Legend is good but Armored Princes is my favorite. Warriors of the North is ok but not as polished or interesting as Armored Princess.
I beat those three several times each but Dark Side is lacking something. The beginning wasn't fun for me ( lack of spells ) and now it feels like it's been going on way too long. I grew bored of it too and haven't gotten back to it. Considering the number of times I've played the other three tells me despite being virtually more of the same it's missing that certain something that makes this series great.