I didn't get the impression that Fudge *summoned* a Dementor in to give Crouch Jr. the Kiss. After all, Minerva was right there, witnessed the whole thing, and yet only accused Fudge of bringing the Dementor with him and letting it get out of control.

Fudge is admittedly obstructionistic, but that seems to me to be his reaction to Dumbledore's (apparent) attempt to expand his power base, from Fudge's POV.

That Percy is following the Ministry blindly is not a good sign, for me.

I'm not happy with the lad either. He doesn't think critically about those with authority. But that seems to be failing in his family, because his parents and brothers are certainly falling right in line with Dumbledore in OotP, with vary little critical review of Dumbledore's methods and modes of operation.