Some people claim to "not be able to put their finger" on why Labrie's voice annoys them.
I think it might be the almost constant vibrato he uses in most of his songs... Although on Awake he sortof controls his vibrato pretty well, on most other albums he over-uses this and it's sometimes annoying. It dosen't bother me at all but I'm not crazy about it.
Also, he often adds sighs at the end of words so sometimes it sounds really wierd. For instance, if he would sing the word "Annoying", it would be "Annoyinnngah"... Or something like that... You know what I mean? Anyways, it's pretty annoying....
Despite these factors I love his voice I think he's very good on Awake, although he is ABSOLUTELY GENIUS on A Change of Seasons... The rest of the albums are not bad at all aswel.