I like/hate the fights that are supposed to be "unbeatable" but you can actually win either through immaculate strategy & skill or through power-leveling (usually before you should be power-leveling, e.g. lots of tutorial bosses). For instance, the first boss in Dark Souls. I think the first fight in God of War (maybe I'm remembering that wrong?). The first blitzball battle in FFX. I count Absolute Virtue back in the day in FFXI as one of these, even though technically it's not.