Effective, this is a very big step forwards for undead PC's
Though these are still high LA Templates and are not a good idea for inexperienced DM's or players to use.
I did not realize that more posts were added....
First of all, he is a Vampire Spawn. There is eight levels of it in the Libris Mortis, so there is no LA. However, I didn't trip off the fact that the Lich has a +4 LA...
I am somewhat worried about the spell thief but I gave him crystals that affect undead and constructs, allowing to bypass damage reduction and cause critical damage. So when he gets his sneak attacks and he has some nasty spells that give him a really high hide and move silently, not to mention another spell that raises his AB he has become a pretty dangerous player. (I mainly gave him those so if the PC's try to take advantage of him he has some things he can do. He also has a mace of disruption.)

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.