If you equate intelligence with judgment, then no, Johnson is not intelligent at all.Bit of a difference though, Boris is both intelligent articulate - neither of which meant he was suitable for high office.
He makes up his own narrative and reality based on what he thinks is best for him personally. Trying to run a country like that is liable to get you the nickname ‘shopping trolley’ as whilst he was concerned about his next holiday or the wallpaper in his Downing Street flat, others (some unelected) were able to steer the baffoon in any direction they so desired.