Articles about some chemical process are fine, indeed often excellent.
Everything where facts get filtered and presented, is bad. Read about real world events - especially where different groups or countries were involved - in three different languages on Wikipedia, and you'd think three different universes exist.
The Talk pages are just a first introduction to the sheer madness behind the scenes; one quickly starts to realize that relative few people are calling the shots in a lot of places and that their personal biases are causing serious problems. The "Reliable Sources" policy would be atrocious enough already (there are no objective processes for challenging a source's inclusion or exclusion from the informal list on a given topic, only political ones) without the "power user" editors who are clearly abusing it.
> Read about real world events - especially where different groups or countries were involved - in three different languages on Wikipedia, and you'd think three different universes exist.