I actually think the English voiceovers were pretty good for the most part (and I'm usually critical of bad voicework), but the catchphrases in battle are waaaaay overdone. Even if those are bad it added some sort of annoying charm to the game.
Agreed, a vast majority was performed well and/or with good conviction (there's nothing worse then a voice over who's doing it half-heartedly), and the very few that are bad are endearingly bad. I say this as someone with a very low cringe-tolerance.