Well for me I enjoyed all MK games (never had special forces) . But all of them have mistakes and terrible things that should never have been programmed in. For example: Shinnok is one of my favourite charcters, great story, nice original design, MKA great move set. But his introduction in MK4 was just terrible, easy boss, terrible powers and basically shang tsung without the morphing.
MKDA was the last of the real MK games in my mind, deception was half a new cast of totally terrible charcters and a totally lame boss. I played MKA a lot but it was just crammed together, unbalaced and KAK ruined online. No real fatalitys didnt help, but the best thing about MKA was 100% the story mode.
Back on topic the worst MK game i own is MKvDC. Totally unbalanced characters, infinitys that were never patched, crappy fatalitys, a boss that looked like Blaze for just no reason. A totally terrible short story mode," hi who are you , o hi lets fight". Rage that ruined most fights, the guy who got a hit in 1st would fill up half there Rage metre and have a massive advantage for nothing.