Gladiator's Longbow is really underpowered. Which is fine with me, as Hunter has so many overpowered cards
But it's 10 damage over 2 turns for 7 mana, which is a pretty brutal ratio when compared with basically every other option they have.
The life-save isnt that great because most 5 health stuff doesn't have a LOT of power. As in, you're not face tanking a Rag, since you're not removing it with the Bow, and if it's just a joint-kill, you're spending whatever other resources plus a REALLY EXPENSIVE BOW, which means you're not gaining an advantage
Like, it trades with a Belcher. Over 2 turns. Ick!
For it to see play, I don't even think if it was 6 mana it would be great. Could compare it to Leeroy Jenkins, for example, which goes in and out of face decks. Leeroy would still be better!
If there ever was an actual full-fledged control Hunter maybe it could fit the deck there, but probably not. It's weaker than Gorehowl, and most warriors dont have room for gorehowl.