IMHO the Greek Fortress has camping-facilities that can-be and will-be uttermost annoying to several users. However, these camping-facilities (aka walling and spamming Greek Towers) should be countered with the said "Bandit Units" that show-up "out-of-nowhere".
IMHO it is balanced vs Greeks.
In the other hand, Egyptians are not worth "the hard work of levelling up" because their counter-system is a "mess", this is mirrored by the fact that I have played both CIVS but only have Greeks available at the moment.
My family has been appreciating the game, which is something new to the Franchise.
On My Wish-List I'll set the Mayans and the Chinese as "Out-of-Nowhere-Civilizations" to be Designed, perhaps, with the help of [N3O]Murdilator and Gandalf as well as other professional artists.