Not sure if serious.
Han was far from bumbling, particularly in the first two movies (He was bad in ROTJ, but that movie had *many* issues with characterization).
What are you talking about the first two movies displayed his bumbling ass nature....Being forced to land on the death star because he was chasing a lone ship and ultimately being captured by the empire because he couldnt pay his debts to Jabba...
ROTJ was basically Luke having to save his ass....before they destroyed the death star again...
Like i said i like Solo's character he had heart for a regular ass thief but he wasnt a skilled person by any means...he wasnt any different from a stormtrooper in terms of his fighting skills...