Of the main servers that are full rotational and that get used the most only TWO of those have the default mapcycle (Servers 28 and 29). And currently server 29 is populated (as was server 28 earlier).
Servers 27, 30, 31 and 32 are mixed mapcycles. The fact that people choose to play on the default map cycle server is not the servers problem. You could try joining one of these servers and see if you have the ability to attract players that want to play with you.
The current mixed mapcycle is as follows :
feel free to try and organise a better mapcycle, but as you have suggested, too much of the same type leads to players getting upset. Unfortunately there is some maps that players just don't like and will make players leave, but for others those maps are what people join to play.
" " - Silent Bob
Gamers can really come across with a pathetically huge sense of self entitlement at times