I asked the player this, and the email response is:
"Duskblade is kind of cool, but they have a few problems that really annoy me. Primarily the lack of decent combat touch spells to be used with their arcane channeling ability. I suppose what I kind of want is a nice mage/fighter mix, just with different magical abilities then a duskblade, and without the limited spell list.
A lot of it is that I really liked the idea behind the reserve feats. The idea of having innate abilities that you could use at will based on spells you have prepared seems really neat to me. So I was aiming for a magic-user class that had a decent spell-level progression, but only had a handful of spells to power the reserve feats. The idea behind the elemental channeling ability is that I was looking for some way to actually make the 0-level spells kind of useful.
I suppose the actual physical combat ability isn't really that important to me. I mean I like the concept behind the warmage and it doesn't have very good combat skills. Guess I just would like different abilities and spell progression is all."