I first tried it around 2010 and i searched and watched the Dub version. I for one, didn't know nothing about the storyline, basic concept of the series or characters, so i didn't judge it based on that. Regardless of that, I thought it was pretty shit, mainly because the voices didn't really match the characters and the animation style wasn't all that appealing.
I tried it again during July/August and instead of Dub i went for the Subbed version. That alone made it seem less shit. By now, i was ill as **** ( And remained so for the next month and a half ) and bored, so...yeah, i got hooked on One Piece.