A few thoughts:
I'm a sucker for Capital Autumnal Fire, which is sort of like a big malty cross between an Oktoberfest and a doppelbock.
Also I can't understand the poor reviews that Baltika 6 Baltic Porter gets on BeerAdvocate, etc. It's a perfect 10 porter in my book, with notes of brown bread and molasses... mmm......
Anyone try a Samuel Smith Old Brewery Pale Ale lately? If you like malty English beers, good golly, give that one a try. Full of bread pudding and toffee-ish character. Belhaven makes some fantastic ones as well.
And then there's always Warsteiner. Light, dark, I don't care. My swimming pool in heaven is filled with this stuff.
Can you tell I'm a malthead? If you really want to find "hidden gems", you need to avoid all the hops and sours. There's a lot great malty beers to be had out there as well. The best beers in the world are not all Imperial IPAs and Brett fermented saisons, no sirree.
Here's another one for you..... Gordon Biersch. Yes, the big chain. Talk about fantastic German lagers, man...... I'll have a beer with you there anytime.
As for the other previous comments...
Overall I find that Schell's makes some pretty great beers. The Snowstorm ones are always great.
Hard to beat a Leinie's Honey Weiss on a hot day -- seriously! Even if most their other beers are crap. Big Eddy series, sure, I'll age some and drink it after a few years as it often improves.
Interesting how a lot of these are not so much "hidden gems" as they are just plain blown off. Like Neil Diamond or Karen Carpenter. You'll always claim to your friends that you think they suck, but when no one else is around you're singing it loudly in your shower.
Lakefront Riverwest Steinbier, anyone? Another flagship that everyone in Wisconsin drinks all the time, but people not from this area probably never heard of. Get some. Drink it. Savor it. It really is *that* good.