I think the concern about being too nice is that some women might not see enough layers to a man's personality (beyond the kindness) to see true compatibility.
Many women like a guy with complexities that they can uncover, observe, interpret, and react to. It's almost like food to them. In keeping with the theme, if a restaurant only has one entree and nothing else, they may eventually grow bored of the same old meal and start to believe that there's a better restaurant with more to offer elsewhere. So, while being an incredibly nice guy isn't a bad thing at all, try to consider whether there's other sides of yourself that you can introduce to your dynamic together that will pleasantly surprise her just as much, if not more.
Er... He really didn't write much about what he does, just because someone is nice doesn't mean they're one note and boring. I mean, you don't want to be a jerk...
Also I assume men don't like one dimensional women either...