The following maps are either fairly redundant or play poorly on anything but high-end machines. By redundant I mean that, while well constructed, they don't offer much new that can't be found on a more distinctive map. I realise I'm probably treading on some people's sacred cows, but you did ask:
CTF-BadNeighborsV2
CTF-BloodcoreArena
CTF-Bollwerk105
CTF-Colony
CTF-Esprit
CTF-Fin
CTF-Freespace)(
CTF-Glacier][
CTF-NalisAzure][
CTF-NoonRaid
CTF-Ranel
CTF-Rrajigar
CTF-Terra
CTF-TwinValley2
DM-1on1-Judith
DM-1on1-Nexo
DM-Affinity
DM-Alpu-Tourney
DM-Amon
DM-Anachronism
DM-Ares
DM-Baal
DM-Brutality][
DM-Church
DM-Crolithion
DM-Cyno-Tourney
DM-Distinctive
DM-Empowered (I)
DM-Fool'sBravado
DM-Frantic
DM-Hall_of_legends
DM-Meldrak][
DM-NaliTemple
DM-Oiga][
DM-Pah
DM-Pahgio
DM-Plat-Tourney
DM-Ritual
DM-Synergy
DM-Unreality][
DM-Unsettled
However, if you can convince me that any of these maps has something notably special, I'm willing to give it another try. After all, I used to hate "DM-RidetheDragon" but now I love it, so...