The Germans cruised to a 3-0 second-leg victory on Wednesday, with goals from Arjen Robben, Thomas Muller and an own goal from Barca's Gerard Pique, giving them a 7-0 aggregate triumph in their last-four tie.
"We came into this semi-final during a great moment of form," the former Athletic Bilbao midfielder, who swapped La Liga for the Bundesliga at the start of the season, told Canal+.
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Martinez also admitted that he was surprised that Lionel Messi did not play any part in proceedings on Wednesday evening, with Blaugrana boss Tito Vilanova claiming that his absence was not injury-related.
"We did not expect him not to play, but they still have an amazing squad and any player can do really well," the Spaniard added.
"I've seen the Bilbao match [against Athletic on Saturday] and he just changed the game but, still, Barcelona have a great template and any of their players could have posed problems."
The 24-year-old believes this result only adds to the renaissance which the sport is currently enjoying in Germany and proclaimed the Bundesliga as among the best in the world.
"German football is doing very well. The stadiums are always full, every game in the Allianz Arena has sold out," Martinez continued. "Who knows what league is best but the Bundesliga is definitely in the top three."