A bad standup in general is one with a really bad block:credit ratio. Good standups are ones where you fly very short flights but have a lot of duty time. There was an ORD-MKE standup that was 1:30 block for 7:00 credit. Get paid 7 hours for flying 1.5

We had a standup on the Brasilia SFO-LMT that was a 10pm departure, 1.5 hour flight, then a 4:30am show time in the morning that only paid 4:50 credit. 3 hours block for 4:50 credit. If everything went absolutely perfect you'd still get less than 4 hours of sleep at the hotel due to the super late arrival and 4:30am show time.

Since it was SFO the flight was delayed at least 50% of the time so you could expect to fly 3 hours, get less than 4 hours of sleep, and only get paid 4:50 for it. That's an example of a bad standup.