OK, let's push the psi-warrior into the background for a sec.
The duskblade, to my mind, seems narrow because of some of the class features, such as delivering spells throgh a weapon attack, or lowering spell resistance with a successful attack. To me, those should be the province of feats, thus allowing any aspiring warrior-mage to take them. Also, the name "duskblade" is off-putting and seems to express an implied concept for the character.
The actual spellcasting, though, is pretty open-ended in terms of embodying certain concepts. Lots of spells to choose from, ranging from all different types, but only a few will be known (the latter factor combined with the high number of slots they eventually receive, makes me wonder if at some point this class wasn't intended to be more of a "warrior-warlock"). No weird restrictions on alignment, weapons, or armor either. Although the class's name feels like it carries connotations, in practice perhaps not.
Anyone else care to comment? Anyone had a chance to make one yet?