I disagree.
Sonic Fox's D'Vorah is performing well against tournament caliber players, including players to whom he has lost. He is not beating up on some unknown players in ranked.
As far as Kollector is concerned, he has the tools to be a mid tier character. Perhaps even better. He has the fastest mid command grab in the game at 10 frames. To give a better perspective, Geras's starts up in 18 frames and Kotal Kahn's starts up in 14 frames. The command grab also provides good positioning and okizeme. Unlike Kotal Kahn and Kano, Kollector has 13 frame mid strings that can be hit-confirmed into EX bola. I know that f+1,2,1 xx EX bola lacks consistency, but experienced Kollector players ought to be aware of their surroundings and finish the combo early with d,b+3. Besides, f+2,2 xx EX bola always connects. Kollector also has access to a safe 10 frame mid string that can be hit-confirmed into d,b+3.
I can keep going (i.e., teleport, okizeme after d,b+3, long range buttons such as 4 and f+3, etc.), but I thought I would save the best for last. Kollector is the only character in the game who does damaging grounded combos that ignore breakaways. A staple combo like f+1,2,1 xx EX bola, j.2, b+4 xx d,b+3 keeps the opponent on the ground entirely and does 30%. As far as I know, no other character has this ability.
I am done ranting. REO made a video on this topic, which I will link below. In my humble opinion, there is always no chance Kollector is "clearly bad".