personally this is a hard one....Defiance had the potential to be a far better game overall, i mean i cant really complain since ive played it through about 4 times and enjoy it, but thats because i love the characters and the legacy of kain itself, especially playing as Kain in his highly evolved form for the first time....but the possibilities it could of had, but didnt lets it down
i wold say Blood omen 2 had a cool story, some nice attacks and is probably the most bloodthirsty of them, which is a nice element, but i like Soul reaver 2 storyline, and Soul reaver 1 bosses, there were a lot of bosses, each requireing some nifty trick of beating them that wasnt bind boggling but wasnt a simple slash and run strategy either
LOK - Defiance is best among all parts in the entire LOK Series.
Blood Omen 2 has good story actually but fighting approach in it is very poor. Boss fight was also lame.
Soul Reaver 2 is also good but Soul Reaver is just OK.
Blood Omen is "classic" because it actually inspired my interest in this game series.
Here is my personal ranking order of LOK Series:
1. Defiance (Simply Excellent)
2. Soul Reaver II (Great Story)
3. Blood Omen (Classic)
4. Soul Reaver (Bosses are good and interesting story)
5. Blood Omen II (Story is good but poor gameplay)
I admit that it is difficult to rank these parts because each part is good in its own way.