I honestly believe Falcon wrecks everyone in your B and C tier. Cept Pikachu. I believe that's only slightly in Falcon's favor.
I disagree. Only characters in that grouping that I would say he "wrecks" (as in 6:4 or better MU in his favor), would be ROB/TL/D3. Most of those characters have decent MU's with Falcon: Buffed Ness, Zelda, Link, and G^W are pretty respectable choices vs Falcon now. Squirtle is harder than you probably think as well (I've played Bwett in that MU).
I'm leaning away from maining Falcon in PM, but you can take it from me. A large majority of those MU's listed in his B/C tier are not free wins for Falcon. If they were, I would be playing him every game instead of considering someone like Marth who *legit* bodies most of those characters.
For a rough idea, I'll briefly post what I roughly think the MU is for most the characters (sorry Luigi and Pika people, nobody plays dem characters or I'm too busy being Martha)
B Tier
21. Lucario - Evenish. Possibly 5 points either character's favor
22. Link - Maybe 55:45 Falcon? I predominantly go Fox cause that feels freeish
23. Captain Falcon - Knee
24. Ness - Slightly Falcon's Favor
25. ROB - Probably close to 6:4, some stages closer to even for ROB
26. Mr. Game and Watch - maybe even, Dakpo strikes fear into the hearts of men
27. Sonic - 5:5 to 55:45 for Falcon, Sethlon would probably agree with that
28. Toon Link - 55:45 to 6:4 for Falcon
29. Zelda - 5:5
30. Luigi
31. Pikachu
C Tier
32. Squirtle - Teeny advantage Falcon
33. Ganondorf - 55:45ish
34. King D3 - 6:4ish, can be close to even depending on stage
Edit: the issue for Falcon doesn't tend to be the new projectiles. What makes Falcon's life harder, is the plethora of "anti Spacie" combo tools that also tend to work on him. Edgeguarding and comboing Falcon is really easy when he's stuck with the same crappy recovery, FF status, and his techroll is really punishingly bad still. Ivysaur's Leaf, Lucas's Ice Snot Ball, buffed PK fire, etc that's not really a big issue. But everyone and their grandma getting a CG or combo from Uthrow, and picking x option to edgeguard him, makes him look very sucky.
If you are patient enough, he's very hard to pin down with projectiles (Falco laser can suck a fat one though). If a Pit wants to waste his time charging and shooting arrows, I will gladly let him. He's effectively giving me free space, and slowing down his own positioning when doing that. The same goes for a lot of characters. Wolf shooting Lasers at Falcon is not very phasing. Din's Fire isn't very phasing. Etc. Projectiles at awkward angles, like some of Diddy's stuff, can be janky to deal with, but most characters aren't like that.