I have played all of these games; here's my quick take. 
 
First of all Heroes II/III/WOG were the best games in the series; like King's Bounty I would just want to play "one more turn".  For HOMM VI, I almost feel like I'm forcing myself to play it.  I enjoyed the first Necro Campaign but find myself losing interest in the 2nd one.  All of the modern King's bounty games I couldn't wait to keep playing, and have done most of them multiple times. 
 
My 5 year old son always sat next to me playing "the horse game" (his words) but lost interest quickly watching me play HOMM.
		 
		
		
		
		
		
		
		
		
	
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