She's way stronger than either Yoda or Palpatine. This is canonically stated. And she's only demonstrated brute force, no subtlety or control.
The reason she learned mind control is admittedly weak, but it still exists. And it's certainly not the first weak hand-wave Star Wars has engaged in.
She knows the Falcon because she's been working on it for years and doing simulator training to pilot it. Again, stated in the films.
Worse, you're ignoring a little thing called "the Force". Which gives Force-sensitives superhuman instincts, that let them instinctively do things that regular humans can't, even with technological assistance. Did you have the same issue with Luke turning off his targeting program and hitting the tiny bullseye of the exhaust port, in ANH? That's the problem with Star Wars. "Because reasons" generally boils down to "because the Force". And it's always been this way. Have we forgotten the Force literally fathered Anakin, directly, "because reasons"? Rey's stupidly strong in the Force. So yeah; she's going to be able to do things nobody else could. That's how this stuff works in this setting. It always has been.
Plus, having character flaws like "she's too stupid" means she's not a Mary Sue. Pretty much by definition.
- - - Updated - - -
Probably the most obvious counter to the "Rey never fails!" mantra is pointing out that in their first confrontation, Kylo kicked her ass, knocked her out, and took her prisoner.