The following applies strictly to the PDT team within BCG and not to BCG as a whole:
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1. If you are an MBA, do not join the PDT team. Unlike BCG's consulting wing, the PDT team does not value MBA degree at all. You will see BTechs from random engineering colleges, with no business understanding (and with similar or lesser no of years of exp than yours) being promoted before you. Reason - they do not require MBA skill sets in PDT.
2. Moreover, there is no hiring parity. You may find people with lesser years of exp being hired at higher positions.
3. Internal growth/promotions are adhoc and defy logic at times. For example - a 5.5 yrs BTech can be promoted to a Lead level, even though while hiring, PDT says that at least 6.5-7 yrs of exp is required to be considered for a Lead position.