Looking at the audience section, with 27k entries, 96% wanting to see it and a 3.8/5 score pre-release, it's clear that it wouldn't have been a flop.
For example, the (also Seth Rogan / James Franco) film Pineapple Express: http://www.rottentomatoes.com/m/pineapple_express/
58% rating from "Top Critics". 73% rating from audiences.
The idea that Sony is using the DPRK as an excuse to shitcan this movie because of mediocre critic ratings is flat out absurd.
Step Brothers, 55% on RT, box office of 100M.
Shrek the Third, 40%, 320M.
Anchorman got 66%, 84M at the office and a major cult following.
Hell, You Me and Dupree had an atrocious 21% and had 75M.
That's just looking at Seth Rogen's filmography. There's a million more examples of comedies with low ratings that either resulted in high box office results or a major cult following.
People don't watch comedies to see oscar-winning performances, they watch comedies to laugh. 50% isn't that bad.