X-Men (1st film): Good
X2 (Sequel): Good
The Last Stand (3rd film): Bad
X-Men Origins Wolverine (Spinoff Solo Prequel): Real bad
First Class (Prequel/Reboot): Good
The Wolverine (Loose Sequel to Spinoff Solo Prequel): Starts off good, becomes eh
Days of Future Past (Sequel to Prequel/Reboot but also Time Travel Crossover with Original Trilogy): Real good
Deadpool (Tangentially Related Spinoff Whose Place in the Continuity Is "Whatever Is Funniest at the Moment"): Good
Apocalypse (3rd Prequel/Reboot): Eh
Logan (3rd Film of Loose Spinoff Solo Trilogy): The best one
Deadpool 2 (Sequel to Tangentially Related Spinoff Whose Place in the Continuity Is "Whatever Is Funniest at the Moment"): Good
Dark Phoenix (4th Prequel/Reboot): Bad
New Mutants (Different Tangentially Related Spinoff/Reboot/Whatever This One was Supposed to Be): Real bad
Deadpool and Wolverine (3rd film of Tangentially Related Spinoff Whose Place in the Continuity Is "Whatever Is Funniest at the Moment"/Multiverse Crossover with Protagonist of the Other Spinoff Solo Films Even Though He Died in the 3rd Film of Loose Spinoff Solo Trilogy and the Hugh Jackman Said He Was Done/Technically a Sequel to 3rd Film of Loose Spinoff Solo Trilogy Anyway/Multiverse Crossover and Continuity Merge with the Superhero Franchise that Will Be Taking Over this Franchise/Meta Post-Mortem and Emotional Closure of Not Only This Franchise but Other Superhero Movies from This Studio and Others, Including One that Never Got Made): Good
This doesn't even take into account the MCU crossovers (particularly the upcoming Doomsday) and the question of whether we ever actually return to the original trilogy's timeline at all due to continuity differences and the fact that Professor X keeps coming back to life between movies without explanation.
Is there any other franchise that comes close?