There are too many games in there that weren't good enough. Game 1 they weren't ready. It's never ideal to start a series with your worst game, but it is even more costly n a best of 5.
Game 3 should have been the killer after they dominated Game 2, but they just blew it and stopped playing after going up 3-0. It should have been over at that point, but they didn't have the killer instinct to finish it off.
And they never really regained their footing after that. Game 4 they were lucky to not be eliminated. And Game 5, other than the super line, they weren't very good. In elimination games you need to have your best games, and they didn't in either. Same thing happened last year in game 6/7. They had two chances to put it away and had 2 of their worst games of the series.