Mandalorians in the OT and PT are only cool because the Mandalorian culture hasn’t been established yet, so they by definition don’t act like Mandalorians.
Mandalorians in Clone Wars were a pointless waste of episodes except for that one Mandalorian who doesn’t act like a Mandalorian.
Mandalorians in Rebels are almost entirely pointless, except for a single episode: ‘Trials of the Darksaber’ where the Mandalorian doesn’t act like a typical Mandalorian.
Mandalorians in The Mandalorian are worthless except for the one Mandalorian who is gradually deprogrammed from his cult of Mandalorians.
In conclusion: