Wikipedia is great for non political, non-controversial topics, such as sciences. I wouldn't trust it on active politicians or other figures of public interest.

One major problem is that you need to submit references to back up any claim. PR companies can easily buy an article in a fringe news site and them modify Wikipedia with a reference to that article. It is almost impossible to roll back.

I once tried to update a company page to state they were going through redundancies. I was personally affected by this, and had internal emails to back this up. However, lacking a public reference it was rolled back.