I disagree with the notion that the tactics were the sole reason for the embarassing performance in the return leg against Real, the players are at fault as well. After all, conceding two goals through setpieces thanks to embarrassing individual mistakes killed the tie early, long before tactics really mattered. I actually think that Guardiola made bigger mistakes in man-management than with his tactics and was partly at fault for the significant drop in form. The team that dominated and embarrassed pretty much everyone in the Bundesliga turned into a boring, less effective and actually beatable team at the beginning of march. That's why I disagree that you can judge the manager solely on CL games. If you ignore everything that happens around those few games, there's no chance that you can form a reasonable opinion and you just end up using stupid stereotypes. I criticised Guardiola's tactics as well, but it's still only part of the story and in my opinion a smaller part than most critics believe.
Of course, he's expected to win the league and not winning it would be considered a failure. But how you win the league and how you perform still matters, big time. Again, I highlighted the 'He will solely be judged on the Champions League' part for a reason. The fact that we won 3-0 in Dortmund in the first half of last season is incredibly important for example, Heynckes never managed to beat Dortmund in the league. It's worth highlighting and shows how his tactics can actually work against opponents, that always caused Heynckes major problems. As dominant as we were in 2013, we could have easily lost the CL final against Dortmund, they were by far our most dangerous opponent. If we don't face them in the CL but beat them in the league, it matters. If you look closer at the final in 2013, you can see how Heynckes got his tactics completely wrong and individuals changing their roles during the game turned it in our favour. Schweinsteiger and Ribery clearly deserve a lot of credit for that, which also was pointed out by Sammer. That shouldn't take anything away from Heynckes of course, he deserves all the praise he gets for what he did in those two years and I rate him a lot, always have, even during his disappointing years. Ignoring all that is in my opinion stupid though, and definitely ignorant.