Hey hey hey.
Thunderbird drops crap that might be too GOOD. There's a point to be made about icy weapons being trash, but that thunderbird gear is kind of 2good.
The summon staff (at least did, dunno if it was edited since I last posted about it) goes ABSOLUTELY BERSERK on things and murders them dead. The thundertalon sword is autoswing, projectile, AND makes light which is pretty much the holy trinity on melee weapons (the only downside is the meh damage, but it easily holds its own until you get a blood butcherer or blade of grass) the accessory is nice unless you've gotten lucky and found a bunch of other more useful toys, and that expert mode bow is pretty perfect for fighting EoC as soon as you knock thunderbird out.
To say nothing about the armor's decent defense, innate double jump (also extremely handy for EoC), and the throwing weapons being an efficient replacement for shurikens and throwing knives for quite some time.
I think you just focused too much on the tools. Literally everything else is fantastic.