To be honest, I've been doing Flashpoints solo, which are tough, but I was thinking to myself I should really be able to do these group activities alone. So, yeah, I get you there. It does 100% feel like a single-player game now.
To be fair though, I do find it hard to get anyone online when I'm on, so for me and I'm sure many others with that problem, it's bad, as I don't feel punished for not having anyone to play it with