Maybe Gehenna was too forced, but it felt out of place in the game for me.
As for customisation, there's tons of options available in the game. Each of the 5 clans (Daeva, Nosferatu, Ventrue, Mekhet, Gangrel) has about 2 dozen bloodlines that have their own rich flavour and vampiric characteristics.
The societies you join seem more interesting to me than the Camarilla (nice name) vs Sabaat etc. Masquerade had subsocieties within those but they felt too exclusive and hard to get into whereas Requiem has well defined societies with different objectives. I noticed quite a few have their own pagan/magic thing going on.