I'm not a hardcore player, but I do play enough to reach the level cap and complete most of the content before the next expansion. Is it the nature of where I'm at to be cranky? There's just not enough stuff to make me happy anymore. Like the kid who wore out all his Christmas presents and says to mom "I'm bored!". What does the kid do? At mom's behest he finds new games to play, new toys (or old toys rediscovered), or even uses his imagination to come up with something on his own. It's understandable that he's cranky, but there's a reason for it, aside from the immaturity of being a kid.
Maybe I'm that kid (hopefully more mature) and I just need something different for a while. Take a break. My criticisms aren't really my anger at the game for doing something wrong, but simply an outlet to the fact that I'm out of stuff to do. Boredom isn't fun and makes people grumpy. So, while I have valid concerns about the game, I'll try not to harp on them too much. I guarentee I'll be posting positives when the Book 8 patch notes are finalized.
In the mean time, I think all of us that are at the level cap, who have completed the content we find fun, should take a collective breath and understand what's fueling our disgruntlement. LOTRO may indeed have flaws (what game doesn't?) but realize it's our boredom that's causing our grief. Like beer goggles make the ugly beautiful, boredom goggles make the paper cut seem like a gaping wound.