I think 6:4 is fair, maybe a bit too generous but it'll do. As for falco, campy falco's on FD can honestly go #$% themselves. They laser you as soon as the match starts, so you have to time your pikmin plucks. Then once you have your 6, you try to hop over the laser and pikmin toss... only to have falco reflect them. My friend plays a really campy falco, and even though I manage to beat him 70% of the time, it is purely based on the fact that I am better than him. It just feels like falco is perfectly suited to fight olimar. Either that, or I'm wrong and I'm not approaching this battle properly.
Oh and for reference and comparison, I'll post what the falco board wrote in their matchup thread for olimar:
Week #3 : Olimar
* Behaviour : Olimar s pretty versatile... When he's far away, he sends you Pikmins. But when he's close, he can grab you with his sick range, smash you with his Pikmin, use his UTilt, or even use SH Aerials...
* His scaring moves :
- Pikmin Throw : A move that Olimars love spam at a long distance. If you didn't reflect them, you can easily remove stuck pikmen with Nair, Jabx3, or Phantasm.
- Grab : Amazing Range... The only way to avoid the grab is to play defensive. If you are too aggresive, he will calmly grab you.
- Up Tilt : Very annoying move. It lasts a long time, and is a very good defensive move. The only move that you should shield (for a while), then shieldgrab.
* How to win ?
- Phantasm is NOT your friend against a great Olimar. A lot of his moves outpriorize it....
- Play defensive and a patient game. SHL and SHDL perfectly timed are very useful.
- Let him go to you. Don't run into a stationary Olimar.
- Chaingrab is less effective against a good Olimar, since he can escape it a a certain percent. And if you miss the grab, you will get grabbed... However, down-throw to spike is very useful.
- If you have to approach, Dair at a diagonnal angle and Bair can be great.
- U-Smash, if used by surprise, can be very effective to kill.
- And last but not least, if you hang the ledge while he's trying to recover... He will simply fall to his death ! :D This simplifies a lot the edgeguard.
* Match-Up (Average) : 5/5. If you lay a patient game, with moves at the perfet moments, you will very probably win.