Ok so you can STILL use one effectively as a no-brain warrior, but would you say a mage vampire lord >>>>>> other types?
The Vampire Lord and a Mage as the "base" character would work extremely well together. Since all of your enchanted equipment and Perks that affect other things with your character (spell damage, magica regen rate, etc.) still have their normal effects when in Vampire Lord form, and the Vampire Lord's powers are really based off of Magica and are more magic aligned, then playing a Mage Vampire Lord should work out beautifully.