I have now watched Rec 2 and Quarantine 2.
I like Rec 2 more. It runs a Swat team through the same apartment building to try to find the previous group sent in. No airports no offsite locations. I watched it with subtitles and really liked it. I tried it with the movie The Hoard and enjoyed it more than the english dubbing. Sets up for a Rec 3 moving beyond the apartment building. I'd give it 5 out of 5.
Q2 picks up on a plane and ends in an airport. The link to the first movie was ok, but I felt there were too many "Aw come on..." moments. Set up for a Q3 is ok. I'd give it a 3 out of 5.
Gonna watch Rec and Rec 2 back to back tonight.