I know providers prefer a hobbyist to be a gentleman, but what if he is too nice, will it make you feel uncomfortable with him?

Gentlemen is one who can handle any situation with poise, confidence and elegance and doesn’t fly of the handle start cursing at someone at the drop of a hat.  

“Too nice” is a fake behavior and comes across as phony.  

I never trust the “too nice” type man or women.

Gentleman respect boundaries, their own boundaries and others. They are kind and respectful of others time and energy.
Nice guys aren't often very nice, they're boundary pushers that cloak their behavior in "niceness". "Nice guys" often harass and annoy, they give unsolicited and unwanted attention. And yes, it does make others feel very uncomfortable with them.  
What inspired your question?

I think it is our job as providers to make every fantasy come true and to excel in whatever expectations a hobbyist would have of us from reading reviews, boards and etc.  A hobbyist being extremely nice should be expected because as long as no boundaries are crossed it means we have truly done our job well! : )

Yeah, I actually agree with that assessment.

There is "real" nice that comes from a good place in your heart, and then there is syrupy phony sweet where the person always has an angle.

Don't worry Senor Grumpy, no one will EVER accuse you of being TOO nice, or me either I suppose. lol

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They do it to bang a variety of women.

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...he moved the dishes before peeing in the sink."

Old school,  Krunch.  Kids today don't know to do this.

Reminds me of an old joke.

What is the definition of a gentleman?

A "gentleman" is one who fucks his girlfriend in the mouth BEFORE he fucks her in the ass!

They just piss straight into the dishwasher. lol

downright disrespectful.  Might as well piss in the toilet and leave the seat up.

It never even occurs to me to put the seat down. Twenty plus years of bliss, I can't wait for the next twenty years.