I'm not that great at figuring out why I like them yet, but I'm a fan of richer and more full-bodied ales and lagers.
Two of my current favorites are:
Beer: Abita Turbodog
Origin: Abita Brewery in Louisiana ... http://www.abita.com/
Reason: Abita Turbodog is a dark brown ale brewed with Willamette hops and a combination of British pale, crystal and chocolate malts. This combination gives Turbodog its rich body and color and a sweet chocolate-toffee like flavor.
Beer: Gordon Biersch Marzen
Origin: Gordon Biersch Brewery and Restaurant
Reason: It's good!