It upsets me that everyone says the doc is bad. It now goes so far and people say he's the worst character in the game.
Warning: Huge text
Jab = One of the best in the game ( frame 2 ) and kann be canceled to a UpB/ Grab as example
Bair = Autocancels, good range, good DMG, killmove, nice pressure tool
Nair = Autcancels, Frame 3 so its a very nice combobreaker
Fair = Insane killmove, DThrow Fair is on a lot of characters a true combo so its a killcombo on like 60-80 %
UpSmash = Invulnerable on the head, can kill early
FSmash = His strongest smash. Not the best range but its hard to punish.
DSmash = Good range, nice for roll reads because the back hit is very strong
Doc Tornado = Ridiculous priority, helps mobility and recovery a lot, really good edgeguarding tool and kills very early
Cape = Can reflect everything and is good for edgeguarding
UpB = Great OoS option ( Frame 3 ), killmove too
Zoning in general: Pills forces people to approach you, FTilt, BThrow and Bair are too really good tools to zone
Combos: DThrow is a great combostarter, UpAirs has a nice kb angel for more follow-ups, DTilt and UpTilt are important too
Recovery: Many people say that the recovery sucks because they can not deal with it. I have no problems with that because I use the tornado very well and it can mixup the recovery. You can say many things, but his recovery is not as bad as everyone says.
Speed: Thats imo his biggest problem. It makes punishes/ reads harder. But you can deal with it because zoning.
In summary: Good Frame data, good pressure tools, insane killgame ( many kilmoves, much killpower and DThrow to Fair ), constant combos, a real zoning game, can edgeguard really well
So I dont think that he's with all this good tools low tier, please. No one uses him in big tournaments what makes me sad because he is really good ( somewhere in mid-tier )