Not actually a bug (and not worth its own thread, I guess), but something that everyone probably already knows about: the game filter categories are kind of arbitrary (which companies are listed or not, and some overlap, too). Also, games are not always listed under the most appropriate filter (for example, many are lumped together in Misc pre 90s rather than being put under the concerned company).
Are there plans to overhaul this, maybe using game metadata instead?