Even sounds about right to me.
Fair is a horrible aerial. You can't really attack it, you've only got a few choices. One is running away, which isn't very manly, the second is shieldgrabbing, which works fairly well, even though it eats your shield a bit, and third is using the invincibility frames on spindash, which is the option I seem to abuse most often.
Ness' PK Fire isn't really that much of a problem to Sonic. He's got too many ways to reach Ness before he can safetly do it; spinshot, just running, either's good.
Commonly Used Moves : (I play a little Ness so here goes)
Uncharged PK Flash for edgeguarding. It can force mistakes just down to the fear factor of it, or it can just damage the opponent, it doesn't really gimp.
Fair, which is basically Ness' only approach. It's good though, big range, hurts shields, hard to counter.
Nair, very fast, high priority aerial. A good GTFO move in the air, with high knockback.
PK Fire, used for spacing mostly, but also as a general damage racker, it can be followed up out of if opponent doesn't DI out of it, and can hold people in position for KO's.
Fsmash. Ness' best killer. A little on the slow side, but pretty strong, especially when sweetspotted.
Utilt, for juggling at low percentages.
Bthrow as a broken piece of **** of a kill move, lol.