sciolist (one with a pretentious attitude of scholarship; superficial knowledgeability.) might work.

or in a more figurative sense:

brummagemer (Cheap and showy; meretricious--Alteration of BIRMINGHAM, England (from the counterfeit coins made there in the 17th century))

or
clinquant Imitation gold leaf; tinsel; glitter.

(all def's courtesy of AHD, via atomica)

FWIW, my first choice would've been bloviator, since it's just such a cool word (hi, hyla!), but someone already mentioned it.