@ssasala That, I think, is the real issue. The cards are probably just barely too inefficient to really be competitive.
Really--I think the deck has two things going for it. First, you can almost certainly beat shops if you want to, since you can play a gazillion ETB kill an artifact creatures, and your aggro plan isn't that bad (though Ballista makes life harder). You've got cost reducers to fight through Sphere, and cards that make many shops draws look positively embarrassing.
Second, the goblins engine is pretty dumb in the number of cards it assembles (just in raw quantity). Better still, your engine isn't just spinning its wheels, it's also getting them dead. You've got a real shot against fair blue, as you're not really all that harmed by Force of Will (most of your cards are just goblins!). Yes, we're going to get roflstomped by the unfair blue hands, but we're not just dead to the volume of cards from Ancestral if we're caverning down Ringleadeader et. al.
Our problem is that the aggro plan is the worst of all viable aggro plans, and our combo plan is likely necessary, but quite fair all things considered. It can and does fall apart to a lot of things, and it's only barely a legacy strength plan (and the legacy deck relies on Vial+mana denial). Sure, there are truly busted and unbeatable starts (Lotus, Mountain, Warchief, Piledriver x2, they're dead), but you need more going for you than other decks, and you're subject to the whims of your opener.