Personally, I am a fan of picking just about every note. James and many others play legato very well, it's just not what I am into. And since I have only really studied IN DETAIL one guitarist, John Petrucci, I am a sucker for alternalte picking. His book and video "Rock Discipline" have both been a godsend to my once really shaky playing. It's helped my accuracy immensely, which in turn helped me play faster when i want to play fast.
About slurring notes: do you mean with the bar? Hitting the bar with the palm of your picking hand ala AGHORA/Steve Vai/Petrucci? That's a beautiful sounding technique, even though I don't use a bar on my guitars, haha!
See ya,
Dale