Yeah, Oblivion is usually the most reliable, but it and Nemesis being the two oldest of the major rides seemed to have had the most downtime, obviously excluding Wicker Man, so maybe it's just their age! On a different note, Oblivion still remains in my top 3 at Towers, just barely though, I've started to enjoy Galactica more every time I go on it, could soon controversially be in my towers top 3!
Could be age i guess. Like you, i'm enjoting Galactica more with time. To my surprise the Smiler seems to be the most reliable thing in the park now, Have rode it well into double figures this year and it hasn't felt that rough at all.