No one can ever guarantee you'll find love online, it doesn't matter whether you've signed up with Match.com, eHarmony or whatever other site. Most of them charge for memberships by the way.
I know of two guys who met a woman on ANastasiadate and both of them are still happily married. Then again, I know plenty of guys who've dated more than 3-4 women from match and all their relationships have ended because the girls weren't into anything serious! At the end of the day, I guess it just depends on your luck.