DC Based Properties/ Warner Bros
Average Score: 52% (Rather Coincidental)
Marvel (All Studios)
Average Score: 48%
20th Century Fox
Average Score: 57%
Sony
Average Score 59%
Paramount and Disney
Average Score 71%
When it comes to all studios, DC takes the cake by 6%. The best studio is Paramount/Disney beating Sony by 12%. Only 6 have ever passed the threshhold of 90%, those being Superman, The Dark Knight, Spiderman 2, Iron Man, Avengers, and Days of Future Past (with The Dark Knight, Days of Future Past and Spiderman 2 being tied for the top spot). Paramount/ Dinsey has only had 3 films to pass the 70s, Fox has had 4, Sony has had 2, Warner Bros has had 8! Marvel has only had roughly 5 more movies than DC. The lowest rated movie was Super Girl. All 3 movies based on Female Superheroes have been rated 10% or lower.
I hope I could shed some new light on this subject. If I got any math wrong or any facts wrong, please let me know so I can fix that.