I'm not there yet, but I've been trying to think about what marks the boundary between being a new player and being an intermediate player. (If you like a term other than intermediate, I'm game for a change in terms.)
My present thought is that a big marker for this transition has to do with knowledge of the cards and of the common deck types. When you get to the point where your losses are rarely or never attributed to the fact that you did no know what Card X could do or you had no idea how to deal with Deck Y, then you are moving out of the newbie zone and on to being an intermediate level player.
At the intermediate level, you might still lose frequently to certain decks, but you at least understand, in theory, what they are and how to beat them. The newbie loses lots of games because they have insufficient knowledge of the game. The intermediate player lose because they have insufficient skill.
Not sure if that rings true to you or not. Do you have another way to think about the difference between being a new (or novice) player and being an intermediate level player?