What's so wrong with Hulking Hurler?

[Fieari]

What is that, a Str 183 Colossal creature? Or Str 203 Medium creature? (Or some bizarre Str 180 quadreped that somehow can throw things, maybe?)

The latter. The HH class says nothing about quadrepeds not being able to throw things. Nothing at all. We've got a tauric (sun elf+brown bear) going on, which is LA+2, and then it's also half-dragon. It's naturally large, but buffs to collossal. (Buffs also include growing six new arms and then fusing them back into two, amongst other things... many of the buffs are actually mental stat buffs in order to activate magical items later on that do various things... like increase size, and the order of buffing is VERY important as some of the buffs then LOWER mental stats considerably) The final build only has 15 HD, and its saving throws are abyssmal. This HH will die rather quickly if the enemy gets the drop, but once it gets to attack, it can kill just about anything except planets. Moons are probably in the range of something that can be killed.

 

[Saeviomagy]

I suppose you could take Monkey Grip to use a chest for 3d6 as a medium creature, but at that point there would be no advantage since a Monkey Gripped greatsword could do just as much with a better threat range. IMO it is definitely the hulking hurler and not the improvised weapon rules which are broken. I'll grant though that it would have been prudent to impose a maximum damage limit just in case somebody later wrote a feat or ability that eliminates maximum weapon size.

I really don't think that the CW rules are at all necessary. The basic rules already have a description of an improvised weapon (club, thrown 10ft, 1d6 damage, 0 cost), and all the DM really needs to do is decide how appropriately shaped a weapon is, assess a penalty to hit based off that, and decide what size of club it would qualify as.