Are you serious? You’re actually comparing power options in City to those in WoW?
Take Defenders. We’ll call them an analog to WoW’s priests. (They’re not, really, but we can use it for the sake of discussion, since both have a damage mitigation bent as well as damage options.)
Defenders have access to 10 different primary powersets (mostly damage mitigation and buffs) and 10 different secondary powersets (attacks). That’s 100 different possible specs, without even considering the power pools.
Even if you discount the secondary sets because of their similarity (aside from, you know, damage type, speed, controls, secondary effects, and various other stuff), you have 10 wildly different primaries, in each of which you can pick up to 9 distinct powers (which can be further customized in both effect and appearance). You can straight up heal and buff yourself and allies, use shadows to conceal people and keep them from getting hit, make enemies sick, put up two different types of force fields, set traps, call down storms to batter foes, sap their energy, freeze them in their tracks, or just shoot them in the face with a boxing glove arrow (well, a stun arrow, anyway.) Those are just your damage mitigation options.
Priests…well, you can go with a Discipline spec for healing and some mitigation, or a Holy spec for lots of healing, or Shadow for damage and some buffs. Or you can waffle around with some sort of hybrid thereof. Every priest picks from the same set of powers, though, so far as I know.
Counting all the abilities available to priests, I come up with 75 (including all the racial abilities). Defenders have access to 180, not counting power pools. If you look at a specific Defender powerset combo, they get access to 18 Defender powers, plus their choice from 10 power pools with 4 powers each and (at high levels) from 8 ancillary/patron pools of 5 powers each. So even if you pick a single combo–like say, and Empathy/Dark Blast Defender, you get to pick from 98 powers.
That’s just one AT/Class comparison. IIRC, WoW has 9 base classes and 1 hero class; City has 10 base ATs and 2 epic ATs.
Care to elaborate on how CoX has less flexibility in power options?