Normally I'd agree with you, Ravnic, but I feel like the goblin actually scales a lot depending on whether or not your environment is full of 2/1s for 1 and on how many goblins you have. It always trades with a bear, and while it can be Rabblemaster for 2, it gets stonewalled by so much. It's the sort of thing where Isamaru is acceptable to good in higher-powered formats but is just okay in retail draft. Similarly, Goblin is powerful in that he's very efficient, but he's not very powerful.
Of course, if you can't guarantee that your decks are developing significant board presence by T3 at the absolute latest then yeah, it's going to steal games.