I personally think one of the problems with FR is far too many dieties!
And yet one of the main things that infuriated FR fans was how WotC got rid of some really neat deities between the end of 3e and with 4e. There's a reason why the Sundering restored basically all the FR deities to life.
I also never understood this complaint. If people have trouble with the number of deities, what's the difficulty in picking the list of the greater gods of Faerun and ingoring the rest?