It's not because of the lack of content, but because of how one's success is determined based on how much money they spend on the MTXs. Let's use two examples here; me and a friend I play with. Because I refuse to pay for two subs, or $25 a month to play this game, I am cut off from what many would assume to be basic features of any MMO which include selling things and trading with other players (thanks microsoft for making me pay a useless sub TO PLAY A FREE GAME!). These basic features disable me from playing half the game because let's face it, this game's endgame revolves around two things and only two things at the end of the day; grinding for 13-stars or whatever is selling hot and selling said things on the market. I'm at over 280 hours and have yet to get anything worth of value after grinding SHAQs +50 with my 50% triboosts and 250% rare drop boosts all day. I may be superstitious here but I think non-premium players get screwed on rare drops that are actually rare. Meanwhile another one of my friends who has premium found three 13-stars and three saiki back units (which sell for over 8 mil on my ship) in the past week.
The second example is this guy I play with. He is premium and spends a lot of money on this game. He regularly buys the 400% rare drop boosts (which are $9 a pop) and buys the ragol and sonic packs. He told me about a couple hours ago that he finds those saiki set units and 13-stars pretty easily and he also has over 100 mil already. He only has a little more play time than me. Do you know how demoralizing it is every time I get into a party chat and constantly hear these guys talk about how many millions they've made and how much rare gear they've found that day? It sucks. It f***ing sucks. And I know I'm not the only one here.
And to rub salt on the wound, they have a day dedicated to premium players that give them yet another boost to rare drops and other benefits. Every day I play this game it becomes more clear to which demographic this game was designed for. You can counter-argue that they make all this content free to play all day but you know what? What's the point of enjoying it if I don't have access to the basic features that make this game enjoyable in the first place?