It doesn’t help matters that the movie itself is more than a little rough, but Tito’s combination of multiple stereotypes (the tiny guy who thinks he’s tough, the Mexican hoodlum and the Don Juan) are just too much to deal with at once.
Cheech Marin has voiced a number of different characters in both Disney and Pixar animated movies over the years, and most of them are fine.
It’s enough to make you long for a Billy Joel music break.
However, his early work as Tito the chihuahua infatuated with Bette Midler’s poodle in Oliver & Company is not one of the high points in his voice acting career.