Argentina deserved a ticket to the final after beating Croatia. The Argentinian players played very well and were organized. Rodrigo De Paul and his colleagues in the midfield managed to dampen the Croatian midfield led by Luca Modric. Despite losing statistically, Argentina played very effectively, so they were able to score three goals. Lionel Messi successfully led his colleagues to the top match and he deserved to get man of the match in that match.
Croatia plays different football against Argentina. The players tend to lose track of their positions and lack anticipation when the Argentinian players counterattack. Alvarez managed to threaten the goal and also managed to make a mistake from the goalkeeper for Argentina's first goal of the game. I agree Argentina deserved to be in the final, after all Croatia struggled to find goals to score with only 2 shots on target in 90 minutes.
The key for Argentina's victory in that match was a well-organized defense and Alvarez and Messi were eager to score. These two striker succeeded in destroying Croatia's hopes of reaching the final, the contribution of these two players managed to make Croatia lose 3 landslide goals.