I think that as a rule all series should be 5 tests, they give the best and te most complete picture. 2 Tests just make no sense and need to go, just picture with this was a 2 tst series, Ind would be going back with a win !! Perhaps even in the SL series that Eng lost, if it was a longer series, Eng could have got it around. Same for three test series, this one would be so different if it was a 3 test series. All series should be 4 tests atleast 5 ideally. They really help present a more complete picture.