With the style of my current comic, I can only do one page a week -- that's as much as I can draw. There's nothing I can do about that, so I chose to script my story with that in mind. My pacing is a little quicker because of it -- each page tries to have a major "beat" of the scene, so that every page is setting its own mood and feels like something new is happening. I have "5 pages" in the back of my mind as an ideal length for a scene, so that it never feels like a scene is dragging out over the course of months -- sometimes I hit closer to 7 or 8 pages, but it's always something I'm paying attention to.
In a more general sense, I think 2 or 3 pages a week is what I consider the "ideal."
On Tapastic I don' t think this would be a turn-off! I guess the only downside I can see is that if I didn't get around to checking an update or two, I'd probably drop the series, since I would get the feeling of "falling behind" more quickly than I would with a more weekly schedule.
I tend to prefer a comic that can update more frequently with small updates, so I can stay invested more easily......... BUT: honestly this depends a LOT on how the comic is paced.
If a scene depends a lot on mood setting, the effect is completely lost if the pages are spaced out -- I know I've used the example before on here of a hero approaching a spooky castle, looking up at its huge wooden doors, carefully walking up, pushing them open, peeking inside, and then seeing the dark, grand hallway, and entering, and slowly walking down the hall. As a 2 or 3 page episode, that's heavy with tension. As individual updates of "see spooky castle, look at door" > "carefully open doors and look inside" > "sees hallway, slowly walks down hall" each page feels not only mind-numbingly slow, but individually pointless -- without the buildup and atmosphere of the other two pages, a hero slowly walking down a hall doesn't carry any interest; nothing seems to be happening.
So I think there are some styles of storytelling that can make staggered updates work, and I tend to prefer that kind of update when it's possible -- but there are others that really need and are much more effective with the atmosphere of a complete scene, and I prefer those sorts of comics to update in the way that makes them most powerful!