Lets talk about Treasure (without any undue bias)
These ain't the GG! boards...
Lets talk about Treasure, but with as little of the intangible "aura" that surrounds its name as possible. Lets forget that it may be "hardcore" to love Treasure or that its "cool" to bash 'em just to go against the grain.
I feel that the biggest asset that Treasure has is the uniqueness that many of their games offer. Games like Sihlouette Mirage and Trouble Makers, while not reinventing the 2-D platformer genere, did offer gameplay aspects that truly were original. The stellar Sin and Punishment took some inspiration from Panzer Dragoon and crafted a highly enjoyable, action-packed shooter. Their 2-D shooter, Bangaioh, offered us a fun and funny merging of gameplay elements from Gravitar/Subterannea, Robotron 2084, and Macross (amongst others). The beloved Gunstar Heroes is just a well crafted action shooter in the vein of Contra.
My personal Treasure favorite is Guardian Heroes, which merged elements of Final Fight, Street Fighter, and RPGs. Multiple pathways, unlockable characters, and hidden stages make this one one of my favorite games of all time. Too bad the music is mismatched to the game's theme...
Treasure is not immune to putting out some downright lousy games, though (who is?). Their Diablo-esque Light Crusader on the Genesis is no gem, and neither is their work on Silpheed: TLP. These guys are not gods by any means- dont listen to those fanboys :)
The advent of ebay and game collecting becoming more common has helped some Treasure games garner huge prices on the market. Radiant Silvergun has become infamous for fetching $150+ on ebay. The MegaDrive-only games Alien Soldier and their Yu Yu Hakusho fighting game have also become high-pricers. Are these games worth the price in terms of gameplay? Maybe, but it depends on who you ask.
All in all, I see Treasure as what they are: a grouping of some very talented game designers that are by no means the gods that some may profess them to be. One of my favorite developers.