Well, CoH was heading towards its own ridiculous numbers of currency types, with Influence/Infamy/Information, Prestige, AE Tickets, Reward Merits, Vanguard Merits, Alignment Merits (split into Hero and Villain), Astral Merits, and Empyrean Merits. If you're counting Zen for CO, then Paragon Points should also be counted for CoH. You could probably also count Paragon Reward Tokens.
In fact, most MMOs seem to drift to that sort of system. As too many players get huge amounts of the game's basic currency, they start putting more and more of the things that are supposed to be rewards behind other forms of currency. And then as people amass that currency, they create yet another currency to gate rewards behind, and so on. For example:
Dofus has kamas (the basic currency), Ogrines (the equivalent of Paragon Points/Zen), Kolossokens, Doploons, Almokens, Ice Kamas, Krokens, and Chocolate Kamas (Bronze, Silver, and Gold), plus the deprecated currency Strokens, and the only-given-out-when-there's-a-problem Compensokens.
Kingdom of Loathing (a text-based "Massively Single-Player" game, as its dev team calls it) has Meat (the basic currency), Fat Loot Tokens, Filthy Lucre, Quarters, Dimes, Swagger, Credits, Game Grid Tickets, Lunar Isotopes, Hobo Nickels, and Freddy Kreugerands as permanent forms of currency, and short-duration events generally have their own currencies, including Bone Chips, Crimbux, CrimbCo Scrip, and FDKOL Commendations.
So, really, CO having many different kinds of currency is not a turn-off. It's expected.