Pages where I can spot inconsistencies are often controversial, with long dense discussion pages, edits here are almost impossible beyond trivial details. I dont mind fixing trivia, but not if the actual improvement I think I can make is rejected.
There is a bit of a deletionist crusade to keep some topics small, for example, Ive had interesting trivia about a cameras development process simply deleted. Maybe it is truly for the better, but it is not really that easy to add to the meat of the project, without someone else's approval.
Third, the begging banners really feel a bit gross; I know the size of the endowment, and how long it would be able to sustain the project (forever essentially)... It really feels like the foundation is using the Wikipedia brand to funnel money to irrelevant pet causes. This really puts me off contributing.
Even if it ends up supporting causes I agree with, why would I need the Wikimedia Foundation as an intermediary? I could just give money directly to the causes!