I take it you would not feel you had been to Mass then unless it was conducted in English, a language you understood. What about if you could only hear Mass in say, Spanish, Portuguese, French, etc, would that detract from the efficacy of the Sacrifice?
I remember many, many years ago travelling from Rome to England over the Feast of SS Peter and Paul. A Mass in Rome before starting out, a Mass in Paris on the Feast Day itself, and the conventual Mass the next day in the U.K., absolutely identical apart from the readings and propers. 
Nowadays, one has no idea what to expect when going to Mass in a 'Catholic' church for the first time. Like the Anglicans we have become 'High Church', Middle Church and 'Low Church'. Middle Church, however, means anything goes.
This dissimiltude seems to be dependent upon the orthodoxy of one's pastor and his Ordinary.