The specific echo chamber lies including the spun death threats of certain "high-ranking" Wikipedians, don't need to be mentioned here, as it was not Wales himself that necessarily did this (though he doesn't stop it or keep other such stuff from happening). This is however one of the most serious indications that their management problems are unsolvable with present people involved. This problem has been commented on by a lot of other people, including James Day who says "only a fool would fail to remove obvious malicious libel", e.g. claims about others' motives, spun death threats, as part of explaining the many legal issues involved in the various Wikimedia projects.
Removed claims that Wikipedia is an encyclopedia - it isn't. A "serious encyclopedia" has no visible "stubs", certainly does not let ad hominem rule over content in selection of articles, doesn't permit massive holes in key areas to persist for years, and doesn't let the community point of view of its employees overrule the good sense of historians, mathematicians, and etc.
Removed claims that Wiktionary is a dictionary - it isn't. A dictionary must define the simplest words in terms of other simple words, and it must define complex words in terms of the simpler words. Wiktionary has no such discipline.
Failing to actually BE an encyclopedia and dictionary are two of the biggest issues anyone could reasonably raise with Wikimedia's projects, which are at this point simply pilot projects.