When I quit, we were doing Second Coil, and it was before Savage Mode had been released, so I can't really speak to their difficulty very much. I recall reading about it as it was upcoming content, and at the time it was basically billed as the current difficulty of raids, while the "normal modes" would be released as easier versions. If that is the case, then I'd say while those had their moments of difficulty, they don't really come close to other content I've tackled (in WildStar, but also in other MMOs). First and Second Coil were mechanically very simple. If Savage Mode has become something far more, then I wouldn't know.

However, that would be a single raid out of the entire content. All 4-man dungeons I ever participated in were laughably simple, and trials didn't put up much of a fight either. The thing that killed people the most was telegraph lag (think the Titan EX landslides), not the genuine difficulty of a fight. I think the fact that 99% of the content is ridiculously easy definitely creates a community that expects and grows used to easy content. I think that is what plays a large role in the "one wipe and we quit" mentality that permeates the game, as well.