I think a lot of people overlook this and just concentrate on the minutes. The real thing you should look at is how many hands per level you get in. Its usually the same for a similar buyin tournament. But for example, a $11 tournament with 15 minute blinds will be similar to a $2 - 10 minute blinds because as you get the same amount of hands per level. I do think the 5 minute blinds are really fast and I would rather play in a 7 or 10 minute structure.