Hot-tempered!? Anyone remember back in DW3, that priceless FMV when Zhao Yun urges him to attack Cao Cao, and Liu Bei retorts in a more-angry-than-usual-tone 'Never! I will destroy Wu! Who cares about Cao Cao?'
Makes more sense, now, seeing that he went a bit cuckoo.
I agree with the resoration remark, it could've been restored if Dong Zhuo et al were knocked off their podium and steps taken to restore the Han. It was the likes of Cao Cao and Yuan Shao who didn't really think it was worth putting much effort in restoring order (well, unless they were the ones at the top), so you get the factions arising and all the fighting between them. Straying off the point here, plus I think I'm talking rubbish again.
I have to concede that Shu were a little short on inspirational generals after Guan Yu went, Zhuge wasn't exactly as indomitable (esp after the fun he had with the Nanman), and Jiang Wei was better at being a sneaky blighter and being a smart-arse, not a monster of a fighter like Guan Yu.
I still say it was the loss of the beard that put Liu Bei over the edge