I don't hate Gale, but he screams "I'm trying badly to pretend I'm genuine." He's 100% bullshit and I treat him as such. That said, maybe his story will get more interesting, but when everyone has some crazy backstory, they all start to blend together as not that exciting.
But will Larian allow us to do that? To call out companions for their bullshit? I highly doubt it. If they did, I would be all about calling out Gale, Wyll, and SH about their bullshit. I'd even laugh at Gale's claim he and Mystra were lovers and refuse to believe it.
Right now it is becoming increasingly clear that every single one of the ten companions, plus Dark Urge, are all going to have a backstory involving having been some super-duper mythic character who got downsized to level 1 by being tadpoled. How original!! I'm shocked they didn't make Elminster a companion! Heck, why bother with SH when they could've just made Shar a companion?!!