I have nitpicks about Tides of Destiny and how this one looks as well. But I enjoyed them regardless, hope that this one won't disappoint either. But again, I completely agree that 1, 2, and 3 were a lot more enjoyable. Frontier was okay too.
My favorite rune factory was always the first. I guess that's why I really enjoyed Frontier. Honestly I didn't enjoy Tides of Destiny that much and the RF4 trailer didn't get me as pumped as the others did. But I hope this is just me judging a book by its cover and that I'm completely wrong about it.