The game too easy? By what standards, lol?

I find normal pve modes quite challenging to the casual player to be honest, given the sheer number of mechanics that happens in the fights.

Every job has a layer of complexity that makes it difficult to master. It's not easy to play any job to its full potential. Even RDM.

The MSQ solo-instanced fights sometimes can prove to be challenging if all you expect is to mash a button and win.

There are deep dungeons in this game that are hard to complete the "past-average levels" let alone you trying to solo.

24-man raid don't have different difficulties, but they are usually challenging because you depend on a lot of people doing stuff right. Granted, that is not a pve-inherited hardship, but that's what you have to work with if you want to clear it.

And lastly, like other players mentioned, you can always go the Exteme / Savage / Ultimate modes if you want something to chew on.