+ It felt very 'real' and medieval to be accepting items in lieu of money sometimes, and bartering in the way you imagine people did barter before fixed prices and assembly lines.
- By the time you had Grand Soul Gems with Golden Saints in them, the suspension of disbelief did take some damage, when you traded a merchant his entire stock for a stupid trinket.
( Of course that would be fixed if the Oblivion-invented "Soul-ratings" on the gems stay in SKyrim, and the prices stay duly nerfed )
Oblivions bartering system also had some features that were cool, like haggling - which was indirectly there in Morrowind, where you could simply name a price, and then get a "yes" or "no"
But by and large I felt Oblivions bartering system was pretty poor. What ? Oh, you can only pay 1200 for my daedric cuirass ? How about for 5 of them ? Still 1200 ? But if I sell them separately ? Oh, that's much better... It just felt a little dumb.
Ideally I'd love a marriage between the two - where the Haggling options and the investment-thing stays, but with the system otherwise reverted to how it was in Morrowind.
Ideas, general discussion, calling me names, all welcome.