Right now, the Duskblade is on the top of my "I want to play this!" list. I have a half-elven duskblade with a glaive that should be a lot of fun, if I ever get the chance to play him.
While they do get a lot of lower-level spells, that's mostly to power their main class abilities. They lack decent close-range combat ability (that d8 hit die, coupled with their limited armour, really makes them more of a skirmisher), and most of their spells aren't particularly good outside of melee combat. Really, they're another versatile class that isn't particularly strong.
That being said, I've only used the class once - as an NPC. It was around 5th level, and it didn't survive more than two or three rounds. If that.