Seriously think about it, how many TD's of over 20 yards has Iowa given up in the last 3 years? I'd be willing to bet it's fewer than the number of pick 6's given up by Stanzi last year.
Arizona returned a kickoff for a TD. Does that count? They had another long pass play that set up their game-winning TD. PSU should've had a TD after that blown coverage last night.
But since you asked about actual touchdowns, here's last year: PSU had that 80-yard TD pass right off the bat on a blown coverage. MSU had the 30-yard TD pass on their last possession that gave them the lead. OSU last year had TD runs of 22 and 49 yards. That's 4. Hmm. Do you really want me to go over the 2007 and 2008 seasons, too?
In the end, my opinion is much the same as the OP: I look for a 3-score lead. Also, the play calling also doesn't have to be so simple as to look like it's JV football being played on the field.
We should worry about a stray asteroid slamming into Kinnick Stadium each week Iowa plays. Just because it didn't happen doesn't mean it couldn't.
Wow, this was SUCH a helpful comment.

You want people to make good arguments rather than resort to silliness, and the OP does that, yet you throw this out there anyways. Go figure.
Jon, you also seem to assume that Iowa can score whenever they want if necessary. Which is a bit ludicrous considering some of our games last year, like Arkansas St, where we got up early but then never truly got going again, making a game far closer than it needed to be.
I don't want Iowa to have to find a way to beat a team at the end of a game when they could've had the outcome decided in our favor in the first half, but simply chose not to at the time. Nobody should want that, and thus a 3-score lead, regardless of how the opponent is playing, is NOT asking too much.
If we ever have aspirations for playing in the NT game someday
You're not allowed to have such aspirations; you're supposed to be content with winning the Big Ten. Or so we've been told around here.