Huh. So much hate for Hydra. I like Hydra.
The only map I really hate is Hazard Glacier. It's a small map, barely larger the Armax Arsenal Arena, and with the average PUG's lack of spawn control there's usually nowhere to fall back to if your current location gets too hot because there are literally "enemies everywhere!" This is no different from normal Glacier, of course, and some players enjoy the sense of intensity that this brings. I don't enjoy it, but I don't mind it either, which is why I don't hate normal Glacier. But then you add the hazard swarm, which deliberately follows you around (it does actually follow you, I've tested it) and trolls you when you're trying to do objectives, and now a map with few exits becomes a map with none.
Other maps have issues, of course: Condor and Hazard Reactor are buggy; Dagger is stingy with ammo; Hazard Dagger snipes you; London, Jade and Hydra can have horrible objectives. But only Hazard Glacier makes me want to ragequit the moment I spawn.