I can't see the problem with having mostly ovals. Sure, it may be gimmicky, but at least it highlights what the All Stars series is this time, and it puts a little more emphasis on the true iRacing wizards that do it most of the time in the Pro Series.
The Bathurst enduro should be interesting. Its All Stars pairing up their Pros, and I'm sure the heads of the toastier fans will explode if the pros are faster than their favourite all stars.