True, for Borussia dortmund a draw has been in their favour, even though a win will make them more comfortable. They only need to wipe out the rest of the match with a win, if we talk about convenience. lol
I also agree with you that Borussia Dortmund seems too underrated in this game. They deserve a bigger chance in my opinion to be able to beat Bayern Munich in this match. I don't know what size they are.
Probably, besides a bunch of factors, bookmakers also take into account simple statistics of head-to-head meetings (the last 10 games between them are 8 wins for Bayern, 1 win for Dortmund and one draw), but if you look at the current season, then Dortmund and Bayern have a draw in a head-to-head meeting, and in games against the rest of the Bundesliga, Dortmund is exactly one point better. In general, I think double chance Dortmund is a good choice for a simple bet, and if you play with a long planning horizon, you can take Dortmund's 5.00 win.
Bayern will obviously create conditions where they seem to prove that they are the kings here but even though it's like that with Bayern's condition which is sometimes unstable in anticipation of counterattacks, this can also be an opportunity that Dortmund can take advantage of.