I see that Barrie Wood has made similar observations to mine about the Bristol event, perhaps even stronger ones, about the Plymouth hustings:
Critics have likened Clegg to a kind of Liberal version of a Cameron clone. The alleged 'great communicator' proved to be heavier on style than substance at Plymouth. The lack of passion displayed on QT was replaced by a contrived 'passion' and a conversational-style address akin to that of Cameron at the Conservative conference. I cannot remember ANYTHING of note that he said just one day later !
...I attended the hustings with a view to assessing the next probable LD leader. Frankly I thought he was woeful on the day. From QT and Plymouth evidence it's 2-0 to Huhne ! I am hugely disappointed in Clegg. Moreover, the other two members of our party from Torbay were similarly unimpressed by Nick and one of those was genuinely undecided beforehand.