Just the 1st four so far. I'd say they're pretty good as dubs go (and the lyrics are close to the Japanese), but some people just don't like dubs at all, so it is what it is.
One Piece OP 01 - We Are! (FUNimation English Dub, Sung by Vic Mignogna, Subtitled) - YouTube
One Piece OP 02 - Believe (FUNimation English Dub, Sung by Meredith McCoy, Subtitled) - YouTube
One Piece OP 03 - Hikari E (FUNimation English Dub, Sung by Vic Mignogna, Subtitled) - YouTube
They didn't do opening 5 (Kokoru No Chizu) because of licensing issues or something, the dub hasn't gotten any further than that. Though they did get to the GOAT song in English .
Sogeking Theme - Funimation Dub - YouTube