Hi Olatunde,
All the WikiProjects are individually responsible for accuracy, because of Good Article criteria 2 and 3 taken together. However, I agree with your sentiments.
Please see:
https://en.wikipedia.org/wiki/Wikipedia:WikiProject_Update_Watch (inactive)
https://mediawiki.org/wiki/Accuracy_review
http://dispenser.homenet.org/~dispenser/cgi-bin/categorder.py?page=Category:...