Interestingly, all of the "bad" relationships I've had started off with big-time sparks... and all of the serious relationships I've had started off with little or no sparks.

I think it's just a matter of what you want the relationship to be. If you're looking for someone to mess around with and go out to parties... well, then if there are no sparks, that's not going to be much fun.

But if you want someone who you can be close to emotionally, and maybe have a long term relationship with... give it a while. When I first met my fiance, I didn't have any sparks. There were a few things about him that were on my "I don't date..." list (ie. smoking, etc.) But as I learned more about him and got to know him better... I began to like (and eventually love) him for who he was, rather than just for arm candy.