My only issue with memory isn't memory itself, but the abilities that cost more than one memory point. None of the source skills are worth using because they both cost a scarce resource and 3 memory. There are a few things I'd like to see changed about it.

-Make all source skills cost zero memory, but have them cost a varying number of source points.

-Don't make any skills that cost more than 2 memory, and relegate skills that only have 2 memory to high level skills, and summons.