pic: 1675's REAL IRI Upgrade

[Taylor]

What is it about mecanums that make them so polarizing? The closest analogy I can think of is scissor lifts - they are generally frowned upon for competitive robotics use, but they don't carry nearly as much hatred (or love) as mecanums.
I've yet to see an "I love mecanums they're the best ever" thread; I've seen many "mecanums are the wheels of the devil" threads. Most teams that use them, do so as a bit of a situational compromise - sure, there isn't as much traction or speed as treaded wheels, but there is the gain of lateral maneuverability for minimal mechanical and programming difficulty, compared to swerve/crab drive.

So why the hatred?