So... maybe find a group for some normal raiding instead of complaining that LFR/heroics are too easy. Heroics were quite a bit harder in WoD than MoP, also, so I have no idea what you expected.
Edit: To add some actual meat to my commentary, you can make things as easy or as difficult as you want it in WoW. If you want a more challenging raid environment all you have to do is move up a tier. There is a difficulty setting for everyone. I could understand the complaint if you couldn't simply turn up the difficulty slider to get the proper level of challenge out of your raiding or dungeoneering experience. If you want a truly difficult dungeon find a group for the challenge mode daily - that'll be a blast.