Negative Man can also move with the speed of light, I think.
And Mento can control minds with the helmet, right?
Elastigirl is basically Mr. Fantastic, only female...and she can grow taller.
I don't think Robotman is able to keep up with Thing in strenght, although I'm not sure. He can keep him busy, though, long enough for someone else defeat him.
Negative Man > Human Torch
Elasti-girl = Mr. Fantastic (?)
Robotman < Thing (?)
Mento (Mind-control or not) > Invisible Woman (?)