I don't think anyone should be expecting the same library strength as Game Pass on console. But if you look at EA's Origin Access, you basically get every game on their PC service for (I think) $100 a year. If you compare EA's program to the first party and partnered third party games that Microsoft would have on their own PC marketplace, I think they're similar.
So that's what I'm expecting. Fifty, maybe seventy-five games compared against the hundreds available on console. I still think it's a good deal though. One annual subscription is roughly the price of a single game. I paid the annual price for EA to get Madden PC at launch. Having the rest of EA's PC library available for only $40 extra is great.