Daniel is definitely very full of himself. Usually it doesn't bug me, but the one time it did was the credits on Road Salt.
The fact that he (seemingly) created a huge "who's to blame" section just to he can point out every time he played both guitars, or bass, or drums, or keyboards was really obnoxious.
That said, I haven't seen any Panther marketing that screamed arrogant. At least not more so than any other serious band promoting a new album. It'd be cool if more musicians were completely chill like Devin Townsend, but that's a rarity.