I would not go so far as to call the bike as a whole a huge let down. This is, after all, a hand-built HRC MotoGP race bike. With the race kit, it is VERY close to an actual race bike, that hardly any of us could push to the limit.
The price ($184K) for the bike without the race kit is pretty high, especially when compared to the Ducati Desmosidici Race Replica which sold in limited numbers for about $75K.