I've sailed in an inside and depending on the ship my enjoyment varies. On the Dawn, I wasn't happy with an inside, I think a lot of it is because it was cold so you couldn't really enjoy the outdoor spaces, made it hard to enjoy being outside the room.
Best inside room has been on Royal, I enjoy having the couch so there's some room for "me" time while the wife gets ready.
My preference is still a balcony or better, but it comes down to cost, I still like to cruise 2-3 times per year, so I'll suck it up and do an inside if the price is right.