Wow, a lot of good feedback here. Sorry its taken me so long to respond. I do agree that what I posted was a "white room" situation. I know that measuring max damage is not a good indicator, it just seemed really strange to me that the rogue class can do that much damage in a round compared to what a Fighter or Champion can do.
As to MAP, we may be doing something wrong there. I mean with a finesse weapon the MAP is a -8 to all attacks after the second. So it goes
Attk. 1: No penalty
Attk. 2: -4
Attk. 3: -8
All subsequent attacks -8.
At 20th level this rogue had a +37 to hit, so you are looking at a +29 to hit. When you apply the Flat Footed, which the thief applies very easily, it's a +31. Rolling a 15 or higher for an AC of 46 is not that high. Am I doing MAP wrong? Is it supposed to be going up on each subsequent attack?
As to the questions about Flat Footed, during our dungeon crawl, we played 2 fighters and a rogue. We applied flat-footed by positioning one fighter in front of the creature and then position the rogue in a flanking position behind. The two fighters in the group were able to position in a way that with a simple stride action you can easily position the rogue into a flanking position, giving them their sneak attack on virtually every attack. According to the book, the flat-footed from flanking doesn't go away until someone moves. So if you use it with abilities or spells that keep the enemy from moving ( ie. Hold Person, Immobilize, Paralyze, Stunned, etc ) the rogue can quickly decimate and opponent.
I just think it's broken because they also get so many feats and skills, and can do a ton of damage. And this rouge we played at 20th had 192 HP which is not a small amount, and a 36/38 armor class ( the 38 applied with nimble roll ) so it's not super easy to hit.
I posted this with the understanding that I think we are misunderstanding something, but the more I look at the rules, i don't think we are doing anything incorrectly.