Roms are going to be plenty competitive when the official patch is finally released- probes being fixed makes cloaking much more viable, and plasmas that bat 3 for 3 against tractored targets (or can even do so at ranges up to 20+, sometimes) are plentiful improvements enough, just wait and see...
There isn't really any special ST reason to believe quantum singularity drives are particularly better than standard warp drives, if anything, they are meant to represent romulan ingenuity in overcoming a problem that severely hindered their ability to become major players in the ST universe. In SFC1&2 manuals, it alludes to the RSE being resource-poor; in old, mostly forgotten, pre-ST:NG lore, dilithium was extremely scarce in the RSE, enough so that while the romulans could certainly design effective warp drives, they were SOL when it came to production, which made getting klingon ships an advantage when the rom/klingon alliance was formed. The QSD (didn't they have SFC1 mssions involving roms experiementing w/ QSDs, I almost think I vaguely remember such a thing, could just be my imagination though), rather than representing an inherently superior system, is instead an alternative technology designed by the romulans to get around dilithium supply problems...it's already assumed in the game that roms have QSDs powering their warp drives, in-lieu of the matter/antimatter power systems of other races (as demonstrated when roms sabotage their QSDs in one of the last missions of the SFC3 fed campaign).