Enkhidu said:Names and naming conventions.
Yes some of these were (and are) truly horrible.
What soured me was the great lost opportunity that was T1-4. I realise that this close to heresy on these boards but here was a perfect opportunity to produce an order of clerics with some mechanical flavour that screamed ELEMENTAL evil... not just generic cleric #12 with the same spells as every other 1E cleric.
Of course, I also understand that T1-4 was yet another 1E product rushed into production before it was completed.