Originally posted by Darth Martin
To Marvel's credit, Troi, Guinan, and Vulcans are nowhere near the telepathic might of someone of Xavier's caliber. They've never encountered a telepath that powerful to my knowledge.
No, they have.
The Federation has encountered telepaths that have shown very similar abilities as Xavier such as memory wipes, mind transfers...even a thing similar to the Astral Plane. (When that one telepath was fixing Troi's mother's mind from her daughter that died by falling into that deep pon.)
Also, Vulcans can pull memories from people...the difference is: they have to touch them whereas, Xavier does not.
What Xavier did beyond what we see telepaths do in the movies: He froze a crap load of people. He transferred his entire mind and memories into another body and he focused, with Cerebro, enough to kill all humans on Earth.
Those are feats that put him above the the other telepaths.
Also, there are telepaths that far exceed Xavier in Star Trek. Think of anyone that is a godlike power. The end.