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If you read the numerous forums existing around in the Web, you see that one of the most frequent reason of complain is focusing problems.
Quite often there are user errors or user not full knowledge of this not-easy topic, like requesting objects being outside the Depth of Field to be in focus.
Our first photography lesson (see here) was dedicated to focus principles.

Interestingly, if you wonder if one brand is more blamed than others, we can found some interesting results making some statistics on web forums.
For example, looking at DPreview forum (one of the most popular forum on the net with tens of millions of posts available), choosing the two biggest brand (Canon and Nikon) and looking for posts dealing with "focus error" the percentage are the following:

Consumer bodies:

Prosumer/intermediate bodies:

Professional bodies:

(There is also a forum dedicated to Canon lens and one to Nikon lens but they are not associated to camera bodies so they haven't been considered).

A couple of comments:

What is your opinion? You can comment this article here below.

PS. I am currently a Canon shooter Smile