I saw Malmsteen in DUblin two years ago and he was one of the most technicaly perfect players I have ever seen. Vai, Petrucci and Satch are others - they can play anything at the speed of thought flawlessly.
Dragon Force sound cool and they have a lot of new sounds - yes they have ability but the vids of them playing individually on youtube are pretty cringe-worthy. They sounded like school kids playing really difficult passages that were way above their abilities - very shaky with mistakes all over the place. Not saying they are crap - just not as polished as what you hear on the cd's. Then again - they are making money - just saying there is a huge difference between them and a true 'virtuoso' like Malmsteen, Vai, Satch, etc etc.
Check out Outworld for 100% bona fide virtuosity in a power metal band - guitarist is Rusty Cooley, bassist and keyboard player are equally crazy on their instruments. Song struture is top notch too, check em out.