Although my recent experiences on various routes have been quote good re punctuality, I had a sensational run a couple of years back when flying between LHR and MUC on a few occasions where my return flight (last evening departure) from MUC was late on every occasion (6 or 7 in a row) so although that might just be bad luck on what is an otherwise reliable route it's been ingrained in my psyche as the most unreliable BA route I've ever been on (using punctuality as the benchmark- yes there are various ways in which to analyse "reliability"). Thank God for that amazing lounge