Tager's magnetism system is pretty effective in theory, which does work. But it's not as awesome as Potemkin's ways of getting in.
Slide Head (with its 6k feint), Hammer Fall (along with its P feint), Judge Gauntlet, Potemkin Buster FRC, decent combos from almost everywhere and better mixups.
If you ask me, Potemkin Buster >>>> Tager Driver ANY DAY. Specially with how some general mechanics are different with BB and GG.
Though personally I don't think he really sticks out that much in comparison to other players. He's certainly formidable, but hardly not unkillable.
Tager in the other hand relies heavily on magnetism to do most of his approach work, though hitting somebody with magnetism will probably mean they get blasted away from Tager. You have an advantage, but you have to work some more to get them back in optimal range.
Despite this, Tager's strength with his 360s and 720s kind of make up for his lack of mobility options. If up against an experienced grappler a player could be in a lot of trouble since zoning him out is pretty impossible projectile-wise. His invul and priority during 360s and 720s are pretty great and the damage race becomes rather hard to keep up with once hit by one or two of these. I don't think Tager's really lacking all that much, it's just that he doesn't really have a universally effective setup.