I think many people associate optimism with brightness and loudness, so I feel I should mention that I'm pretty quiet and reserved as optimists go.
I am not mean, but when forced to choose between nice and honest I will almost always choose honesty. I can think of just a few instances (death-bed question from a nice person about whether I liked her cooking?) where I'd swing the other way.
My profile says I'm here for both friends and dating/long-term relationships. I mean it. If you don't think we'd make a good match but want to go walking, or want to play a board game, or want to go see a movie together? I'm game. In such a case a heads-up on the friends-only status so I don't spend a bunch of time speculating on my romantic odds would be polite.
If you honestly don't know? I'd rather try for friendship first. In my experience an attempt at friendship that turns out not to allow for romance is usually still pretty great for all involved, while an attempt at romance that turns out not to allow for friendship is just...bad.
Nerd/Geek Disclosure: I am a nerd who likes nerdy things. If you don't have experience with nerdy things but are game to try new experiences, then I have activities we could try out for about as many hours as you have free. If you hate nerdy things, nerd culture, and nerds, I recommend moving on to one of the many other profiles on this fine website.
And if you're a nerd too? By all means, contact me whether you think we're a romantic match or not. I love finding new folks with whom I can watch shows, play games, and generally geek out.