Doc can get some decent distance, and he can defend himself (somewhat), but the 2 big problems he has with his recovery is
1) he has no real options.
-You're gunna land on the stage or grab the ledge. If you land on the stage from an up+b, you're lagged and should be send off the stage again
2) to get the most out of your recovery, you have to make a bunch of commitments
-Torando? 79
-Cape? 35
-Pill? 43
-And its not always so much of what you're committing to doing as much as it could be what you CANT do. (i.e., if you throw a pill, it's not so much that your opponent can get out there and punish you for that as it is he knows you CANT jump for 43 frames, so he can position himself around that.)
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Falco's recovery is pretty bad, but it's still leaps and bounds above docs. He's got options. He's got plenty of options. It's really that, because people know how to fight falco, they know how to gimp a falco real easy. Same can be done to Doc.
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Sheik's recovery by itself is bad. But she's got 2 perks for her recovery.
1) She can cover a pretty long distance by using the worst move in the game. (Down+B) because Zelda's recovery blows sheik's out of the water.
but..
2) Sheik not only can protect herself when recovering, she's an actual viable threat when recovering.
-It's one thing that she can actually protect herself by turning around and b.airing; which is longer than alot of things that may come at her..
-But she can just f.air, or u.air. They both work.
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Ness actually has an overall good recovery, the BIG problem with his comes from the fact that ness's recovery is the only one in the game that literally takes skill (read: you will literally be limited in your options by how little you practice.)
-If you dont practice SSing from above, you force yourself to have to recover low every time, which alot of characters can jump out and stop by just being there (as opposed to being higher, which is harder to JUMP to.)
-If you cant slope, and slope ss, then you limit yourself to landing on the stage in PKT2's land lag... which is HORRID. That's why ness gets *****.
-I mean hell, if you cant SS period, you're ****ed with ness. DJ->airdodge can only save you from so much. XD
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Yoshi's recovery? I dont really know alot about it. I know it's decent beyond the obvious you HAVE to have a double jump. So assuming you have it, it really comes down to knowing the super armor mechanics. Because I have played some yoshi's and seen some pretty witty ****. (DJ as somebody goes to hit them with something weak, b.air past them to knock them away, then come back to edgeguard).
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When it's all said and done, ALL of those recoveries are still better than docs, for one reason or another. The ONLY person who has it worse than Doc is Roy (and that **** is just pitiful).
"Aww... roy got hit out of his DJ in the middle of dreamland, I hope he doe~~~ awwwwwwwwwwww."
I mean atleast Doc can make futile atempts to come back with PTP and whatnot. Roy is just f**ked.
*edit*
if im wrong 18s, feel free to tell me why.
Cause honestly, the way i see it is the way i see alot of things about doc. The only reason why we get away with it is because people dont know.
I mean, that's like people DIing f.airs. I'd take a stab in the dark and say 10% of the smash community really knows how to DI is. I'd go as far as to say I'd guess that most people who post on this forum right now dont REALLY know how you're supposed to DI it to live.
epic combos though. 
