I watch A1GP most of the time but it isn't all that spectacular imo. I don't see that much overtaking. Last year for some reason was more exciting than this year.
The problem is that it really doesn't bring anything new to the table. Not one single thing is unique from other classes. Well, maybe the driving for your nation nonsense. Why is it nonsense? It's just a bunch of GP2 teams running a car for a certain nation in most cases. If it would really be a nations cup, then the teams would be FROM those nations, not just the driver.
Why compare F1 to A1GP? Because of the "1" ? They're completely different series. A1GP better compares to GP2, whereas F1 better compares to Champcars.
And any series that allows goofs like Nur Ali to "compete" can't be taken seriously, GP2 is such a better class!