I read the review of Kings of War and looked at the Lizard list.
For me the complexity of Warhammer is not an issue. Once you start gaming regularly (1-2 times a month is what I would consider regular), familiarity with the army and game rules becomes second nature. You work out your own little formulas for all the dice, including probability with cold blooded, swiftstride charges, etc.
I like the idea of the KoW game (and some competition to GW who will probably simplify their rules as a result), it just seems too simple. I think what KoW needs is the depth of storytelling that GW is so good at to build the passion for a race, it's characters and culture and a few more years of development. The customisation is so important to me. For example you can run a Cowboy with a ward, or with the crown of command and he has a COMPLETELY different function: the first is monster hunting, the second tarpits big regiments of troops with a 90% chance of holding on Ld8 but can't take on characters so well. That customisation is not available in a lot of tabletop games and is a good point of difference that Warhammer has.
Unfortunately I'm not GW's target market as I'm outside the ages of 12 to 16, that's why I think the competition from KoW will be good.