I wouldn't class having to reboot...
..it twice a major cause for concern. Its just rebooting.
I booted it up, said it had X number of updates. I updated. It asked to reboot.
I then rebooted and then it said there were some more available if I wanted them. So I did.
No biggie. It hadn't been used for a month.
I think the point is that its bizarre one OS gets crticised for updates...when they ALL get updates.