West indies botched the first T20 which they should have won in my opinion. Russell was terrible with the ball while Green and Owen's took the game away from them thanks to their high scoring performances.
The Windies can still win this T20 series and salvage some pride for themselves if they manage to restrict the Aussies to scores below 180 again and again.

West Indies top order played very well. If the team could have batted a little better in the last two overs, they could have scored 200+. West Indies scored only 6 runs for the loss of 4 wickets in the last 2 overs. Ben Dwarshuis took 3 wickets in 1 over.
Australia could not start the innings well but managed to win till the end. Australia won because of the innings of Mitchell Owen and Cameron Green. Green scored 51 runs in 26 balls and Mitchell Owen scored 50 runs in 27 balls. Besides, Marsh scored 24 and English scored 18 runs.
Their experienced bowlers in T20 format like Russell gave away 37 runs in 2 overs. Besides, Alzarri Joseph also gave away a lot of runs. West Indies played badly in all three Test matches. Out of the 5 T20 matches, I think West Indies will not be able to win more than one.