All this discussion on which optional papers that you want to do. Here is the feedback I got from a few people about the papers.
Once they passed the paper - they will recommend that paper.
Students that don't pass the paper after 3 attempts will be cursing the paper and "inception" to others to go for another paper.
You will have an average of 50% of each, but those that pass will tend to keep quite and those that fail tend to make more noise (and blame everyone around them as usual)
On average P5, P4 and P7 is the same in difficulty.
Common reason for failing - do not read the question and answering their own questions + not studying all the areas (spotting) + not having adequate background knowledge (prior paper knowledge)
P7 has a higher failure rate when the student lacks a good P2 understanding.
P5 has a higher failure rate when the student lacks a good English understanding
P4 has a higher failure rate when the student has studied everything in the text book but failed to read financial times / business news
Now about P6 (M) it can be said to be easier for the following reasons:
The examiner produces articles that are examined (this is true for most of the other papers too)
The exam questions are written for Malaysian English - easier to interpret
I talked a lecturer who saw the new P6 paper and his comments - not up to ACCA Standard anymore

, worse than AIA standards

. I reviewed the papers and agree with this comment.
Now I have talked to those that did the paper and failed it and their response is:
Not my cup of tea
Hated to memorize so much
Cannot memorize
If you plan to be in tax, this really is a push in the right direction.
On that note, doing P7 is not for audit only. I knew a student from investment banking side who did P7 and the remark given - "I see things that other analyst miss because they cannot read the financial statement and policies like I do after doing P7"
So P7 is not only audit, since it has forensic / due diligence / prospective financial information, which are interesting specialist areas.
Those in audit will definitely appreciate learning P7 a bit more compared to those outside it. Doing P7 while being an auditor always makes more sense than doing full time though.
Syllabus changes in the future - ACCA adopted the evolutionary change strategy, gradual updates rather than big bang style done in 2007. This way students will no longer get extensions for the 10 year rule. A students that signed up in 2000 still has to 2017 to complete ACCA

but a student that signed up on 2008 has up to 2018 to complete ACCA

.
On that note : the syllabus will still be the same. It is not MCQ since there is also Fill in the blank and other types of questions which uses the computer
Hope that helps