Most of [?] agree that the VNM axioms are reasonable

My problem with VNM-utility is that while in theory it is simple and elegant, it isn't applicable to real life because you can only assign utility to complex world states (a non-trivial task) and not to limited outcomes. If you have to choose between $1 and a 10% chance of $2, then this isn't universally solvable in real life because $2 doesn't necessarily have twice the value of $1, so the completeness axiom doesn't hold.

Also, assuming you assign utility to lifetime as a function of life quality in such a way that for any constant quality longer life has strictly higher (or lower) utility than shorter life, then either you can't assign any utility to actually infinite immortality, or you can't differentiate between higher-quality and lower-quality immortality, or you can't represent utility as a real number.

Neither of these problems is solved by replacing utility with awesomeness.