One of the complaints that frequently gets levelled against Elemental Evil is that while Cryptic levelled everything up to 70, mobs and content at endgame became too hard for the average player. While I've been struggling horrendously on my own and even had some issues while playing with my pet tank, I didn't want to jump to conclusions. I'm not very good at this game, and while I think that the level scaling mechanic is very wonky, that by itself is not the same as the game being too hard overall.
Now that I've been 70 for a while though, I can't help but feel that the critics are probably right. I find it pretty impossible to complete the (supposed) solo dungeons on my own, and I used to be able to do that at 60. Duoing dailies is doable, but gets tiring fairly quickly because everything has so much health. (Who thought that it was a good idea that it should take ten minutes to kill two simple frost giants?!)
It's obvious that other people are feeling the same. The big heroic encounters in Icewind Dale used to attract people like flies. Nowadays when a Beholder or giant Remorhaz come up, they stay there until the timer runs out. People just ride around them and ignore them, because who wants to attempt an epic heroic encounter when even simple mob groups out in the world are already tough enough to kill you?