Before that game, Leverkusen would probably be satisfied with perpspective of drawing against Bayern, but I don't think they were happy when the ref made a final whistle.
Leverkusen started off really well, bagging one in very early, in the 6th minute. Later in the 1st half Bayern got crippled by a red card for Jackson and it looked like the 2nd half would belong to Leverkusen, but that's not quite how things unfolded.
It was a pretty crazy game, with 4 disallowed goals and two red cards. Leverkusen looked decent, but their defense was getting really clumsy at times.
Leverkusen should have been able to win the match especially when Munich only played 9 men.. but in this match they were not at their best and their defense was quite weak, so that it allowed Luiz Diaz to score a goal, and even though Leverkusen continued to shoot towards Munich none of them managed to produce an additional goal which made them have to be satisfied with a draw. from this match it can be seen that Leverkusen was very lacking in their attack, and maybe they were saving their energy to fight Arsenal, even though in the end they were also defeated by Arsenal.