two-legged cup ties have a totally different psychology because of the away goals rule. if the team is not experienced and isn't comfortable in its ability to defend, attack and switch between the two depending on the situation, then it's not likely to get lucky. if there's one thing i know about recent arsenal teams, it's that we're least comfortable when having to defend a lead.
we obviously have more than a chance against bayern - i just wouldn't back us against any good side due to our tactical/psychological weaknesses. though we played smart againat barca that one year.