Regardless of what you think of game journalism, there is a standard rule and practice amongst journalists.
You can criticize everything, scrutinize everything, but don't do it to your fellow journalists (at least not publicly).
Besides it being in bad taste to focus on the providers of information instead of the source and information itself (which is a standard practice in politics and law), it casts a bad light on the journalistic field and can sour the relationship of all journalists to their audience.