And telepaths are no use on him either. Otherwise Xavier would have dealt with him a while back. Telepathy is blocked via the armor and his magic.
That's circumstantial at best. Xavier doesn't handle Doom for the same reasons Richards is a net drain on society, because it would mess up the status quo. Heck, the U.S. should have nuked Latveria no later than 1970.
I do figure that Doom would take great pains to not be vulnerable to telepathy, though--so I do accept your conclusions.

As for power, Black Adam alone would tear through any prominent MU hero or terrestrial villain except Thor, the Sentry, Loki, and maybe the Juggernaut. A prepared Doom might have a chance. I don't see Magneto, or anybody else short of a Sorceror Supreme or Asgardian, really being able to fight off a Marvel (unless mastery over magnetism includes the ability to deflect magical lightning

Remind me, did Rogue absorb Thor's powers in Avengers Annual #10? I remember her being pissed off that most of the Avengers were immune to her ability--Vision, Iron Man (absorbing the power of Tony Stark probably isn't exactly a major catch, anyway), and Wonder Man... so I guess it must've been Thor that she was able to. The reasoning being that Rogue can absorb magical abilities--and it is pretty essential to have Ms. Marvel's abilities already in order for her to get close enough to someone with DC superspeed, which has been shown to be a few orders above Marvel superspeed--we can add Rogue to the list of very few people in the MU who could probably kick a Marvel's ass.