He himself did not reform too much, but not for lack of tying. In the end one could easily argue that he helped mainline numerous ideas that had been previously flat out obstructed by the GOP: redistricting guidelines/gerrymandering (wanting to tae the districting process out of party hands altogether), environmental efforts (Global Warming Solutions Act), proposed marijuana legalization, opposed Bush IIs border fence initiatives..in a way he's very California: very immigrant, very Hollywood, very macho but a little hippy, weirdly contrarian and unapologetic about it.
He was not the most effective governor, but he also was not a destructive or fundamentally divisive one (yes he had soe hot points but I can't think of a single governor of this state who hasn't) and he certainly performed better than I thought he would.