First and foremost comes
Solve Unamusements opinion about PBBGs on a very general level. Like everything else they have their pros and cons but after an extended period of time, one of each should be added.
Con: Because they are so simple, a lot of PBBGs can easily be forgotten or bailed on for one reason or another.
Pro: Because they are so simple, it is rare that much is missed if you bail and come back later.
Syrnia was like that, personally, for this writer. Had forgotten the game for a good one hundred and twenty days (exactly) and was then reminded by email that my account may be removed. This was my ticket back to playing (though not as often/much as before) and because of how most PBBGs work nothing was missed from the time off.
So in memory of PBBGs that have been suggested and are either mostly not played or not played at all anymore, a list of all the PBBGs that have been posted via Solve Unamusement. Out of this list, only two are being played (one is because it is yet in closed Alpha.)