I assume you are talking about Storymode on Normal difficulty.
false. I can't believe anyone is complaining about the difficulty. It's so freaking easy. I am on my 2nd playthrough in Olinemode after i played through in Offlinemode. And i am literally stomping everything. And i DON'T have the best gear, i have good gear but i loot everything and i ahve a brain that's actually capable of coming up with some ideas of how to progress through the game. So if you struggle you are either: bad, equipped wrong gear (=bad), have a bad internet connection (unlucky), or a bad computer (can be improved).
If they tone down the Bosses it would be waaaaay to easy. Just to give you a little insight on actual clearing potential and dmg. I play either alone or with friends. We are about 6-7 ppl around almost all the time after work. I am a Melee Sorcerer specced for burst and a friend is a 2h warrior also specced for burst. He deals up to 20k crits in Tier 2 (thats around....lvl 21-32 i guess) i deal 700 crits with really fast attack speed but i am almost immortal once i have my rotation going(we both have around 40% crit chance). Took down Lambach solo in 3 invulerability phases that's a 2 minute bossfight.
So, what you can do now is either use your brain to build something that works, there are a loooot of great potential builds that you can go for, or swotch to story mode story mode difficulty. I also mean no offense saying this, not everyone is on the same skillevel, and god forbid i am not a gaming genius or anything.
Cheers