JJP is a new pinball company that is putting out their first game. No one knows what their games feel like because they don't yet exist. They are going after high end collectors by making games that are expensive and fully feature packed rather than games that are stripped down for cost reduction.
As for your Williams ij vs stern ij, that is a horrible example. Ij stern doesn't suck because it's got a stern feel. It sucks because the game sucks. Not all games are equally good. Some are good and others are turds.