I'm not a beer nerd, but I know what I like.
What I like: almost any german beer, since no preservatives = no hangover
Can't go wrong with Franziskaner, Paulaner, HofBrau etc. The greatest thing for me about traveling around Germany is that almost every town has its own beer, and they're all good and have usually been in business since before the American revolution.
what I don't like: almost any IPA. All the local microbreweries that popped up everywhere love brewing them, and they all taste like sh%t IMO. I know nothing about brewing, but suspect that IPA are 'easy' to brew? A local brewery has 15 or so beers on tap, of which all but a few are IPA - most of them with added nonsensical fruity ingredients to mask the sh&t taste. Personal opinion