The Mig-23 has a kill loss ratio of 25/102 even without the context of every encounter, that is abysmal. Additionally the results of every encounter between Angola and the SAAF is contested by both participants.
The combat statistics for all the aircraft currently in use | MiGFlug.com Blog
Your own source, aviation geek club, hosts multiple articles about the encounters between the mig23 that contradict each other, but the balance of information favors the South African accounts. Even if we take the Angolan and Cuban accounts at face value, as Cpt Miller himself said marginal performance does not negate broad trends and the balance of pilot and crew accounts, in every other conflict the Mig-23 was involved in it suffered abysmal combat performance relative to contemporary's weather they be french, american, british, or even soviet aircraft. The Mig-23 was notorious for its high maintenance requirements due to the mechanical complexity of the landing gear and wing sweep systems, poor radar performance, utter lack of situational awareness (a problem all soviet aircraft share until the advent of the Mig-29 and Su-27) Air crew often complained of stability issues relating to the need to operate the wing sweep manually. While the Mig-23 is a remarkable aircraft, it falls short of its contemporaries in almost all performance characteristics relevant to the era, had significant ergonomic and operational deficiencies that made its operational utility hard to justify.
Perhaps the most significant thing the Mig-23 Represents is the general decline and stagnation of the soviet military industrial complex, and the State. the Mig23 and the technology that underpinned it are fundamentally backwards look and represent the beginning of the mid-70s technological Gap that the soviet union was never able to close. The Mig-23 is representative of design trends that were regarded as obscelenant and had already been abandoned in the west. The mig-23 would have been a serviceable aircraft had it entered service years earlier then it actually did, and by the time of the types actual entry into service, technology and counter tactics had been developed that rendered the threat posed by the mig-23 to be minimal.
What Cuban paid you to make this post?