so I recently completed training. Some stats...everyone passed the oral on their first try. statistically 25% of our class failed the check ride..they retrained and passed. Varying type of experience, but all 121 guys. One guy was unfortunately let go due to weak systems knowledge and weak flows - 135 guy..the class before ours I think I heard a couple people busted the ride, and the class after ours a few failed the oral. To my knowledge everyone who "failed" an oral or ride retrained and passed...
As far as instructors go, its all luck. I was EXTREMELY lucky and had awesome line pilots teaching me, where some of my classmates had the majority of their CPTs and CSIs taught by "ground instructors" some of them who have never flown a jet, but are picked out of 141 CFI jobs, given a type, and told "teach indoc for 2 years and then we'll let you fly". I will give them enormous credit for what they do (you could never pay me enough to teach indoc) but its a unfortunate fact that the new hires who are being taught systems and flows/procedures from people who have 0 turbine time are definitely getting sauced on portions of their training.
Some good news, some instructors are currently trying to reorganize the training syllabus and I got to grab a sneak peak and they are sincerely trying to make it better. So give them credit and just give them some time to get it done.
Overall, you need to come prepared with flows memory items and limitations down cold on day 1. Agreed everyone tells you something different and all you focus on is Flows for the first 2 weeks, but having the limitations and memory items, and having watched the CBTs already at home, holding that info in your back pocket makes the program much more manageable. It is completely up to you to put the work in.
All that being said; its a great feeling getting out of that sheraton!