I usually assume when Europeans complain about American beers, they just are complaining about our “domestic” beers like Bud Light, Coors, PBR, etc. which makes sense, they are our bottom shelf beers.
I recently chatted with someone at a party who said “no, all American beers are bad” including microbrewery beers.
I’ve never been to Europe so I wouldn’t know, but I do like my Left Handed Milk Stout, NWPAs, and hell even the hipstered out IPAs.
Are these what y’all are referencing?
Or gueuze. They tend to be a bit hard to find in the US. Sour Flanders red ales are another good style, and also difficult to find.
IIRC, a proper lambic is made with spontaneous fermentation, which makes each batch slightly different.