I agree. He says the same fairly bland stuff all the time because he doesn't want to blurt something out that he later regrets or reconsiders. He's clearly someone who prefers to articulate their opinion privately in the cold light of day to the people to whom it matters.
Strachan was funny, sort of. Holloway is funny, sort of. Mourinho is very entertaining. That is their style. Each to their own. If you mistake what must be consciously bland interviews for a lack of intelligence or charisma then your probably missing the point IMO. Unless the interviewee is Alan Shearer, Mark Bright, Martin Keown or one of the other numpties on telly, in which case you would probably be right.