Please advise...

Ever since i started going out with McCombers, I have made it my mission to educate her.
Her taste in films was laughable, i'm happy to say that she's come along way. She loved Captain America, Thor, and The Avengers. (But who didn't?)

And recently we watched the new Spider-man which she also enjoyed. This prompted me to buy the Sam Raimi/ Toby McGuire Spider-man trilogy. She watched and thoroughly enjoyed Spider-man 1 & 2.
Now, people of the internet, I ask you. Should I make her watch Spider-man 3?

I am torn, yes it is considered not nearly as good as 1 & 2, but surely watching 3 would make you appreciate the other films all the more.

Please advise...