The Nesses on the Ness boards have been tending to think that Ness is a lucas counter, and while I don't like it, he does have a good advantage over lucas on the ground most of the time. But we have something that they don't: recovery options. Ness sucked in melee due to the fact that everyone and their grandmother could gimp ness. So basically, knock Ness off, eat their double jump w/ a nair or something (from behind, they'll be doing a rising fair), and then either Psi Magnet their PKT, or just attack it (getting hit by it works, too. 8% for a life? sounds good to me)
On the other hand, you won't be seeing many Nesses in tournaments.