This is my "take" on this post. When I first began exploring my sexuality as Melissa I met a lot of "straight" curious guys that wanted to "date" me. In reality a date was more like a rendevous at a hotel room. I didn't really mind as it was all part of my exploration and I wasn't looking for a LTR. I think many guys are attracted to pre-op transgenders because we aren't quite what they are accostomed to with GG's. I think most t girls are passionate about pleasing their partners. At least I know that I am. As Tom Waits says in the song "Get a little somethin' that you can't get at home!"
Regarding if it will be "too good" I think it must depend on who your partner is and how passionate they are about pleasing you!