The lagering process produces a crisper, "colder" taste.
mbms characterization of lagers is unfair. Many high-quality lagers exist; dark lagers and heavy-bodied lagers, while rare, are a unique and satisfying alternative to craft-brewed ales.
For many decades, lagers dominated the American beer market. This ended (thank God) with the micro- and craft-brewing revolution in the early 1990's, when ales once again became popular.
Perhaps mbm is thinking of the Pilsner style of beer, which is always light-bodied and rather bland. Pilsners are a type of lager, and the qualities of the two are often confused.
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