Don't 'hat' on Lucy. She doesn't deserve it-- it would mess up her nice hair.
She also doesn't deserve to have Natsu inflicted upon her...
Seriously though I see nothing silly about Lucy except for her occasional failure to use celestial spirits (tho it's more something that happens in filler, I believe).
Its Lucy. Hands down. I knew they would be the main couple since they first met each other and after the S-class exam arc. That was a big clue as well.