Is it fair to implement Duckwort Lewis (D/L) method in a 20 over match?

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D/L method becoming a villan in this tournaMENT, it decides the winner in the way it likes, thats what i have felt about the method. I always belive that it makes the tema defeat which would have won the match. D/L never decrease the wickets when they reduce the target. yesterday two match result was made using this rubbish method. In amatch were WI would have probably lost chasing a huge a very good total, they become the winner by their performance of 5.5 overs.is it fair? and the match zimbawe lost could have been in the other way if they ahve played the allowed overs, the main disadvantage the zimbawe had was that their runrate went down to -2, which wont have happen if they have palyed the match in full overs. now they are virtually out of the tournament and T20 is a mini cricket, its already made small and how can you judge the match with just 5 overs? D/L should not be used atleast for t20.