Mine is that Discovery should have been a series taking place in the Picard era.
TNG is boring as hell, genuinely, and a complete abandonment of the space opera formula that gave TOS its charm. The entire TNG cast is dull and equally as robotic as Data, who gets far too much emphasis every episode. It’s exhausting and repetitive to constantly show Data making the same head and eyebrow movements, demonstrating emotions like irritation while everybody pretends he doesn’t have emotions, and everybody prefacing every sentence with “Captain…” Frankly I think TNG was written to appeal exclusively to nerds who get off on watching people do things robotically. The only interesting character is Q because everybody else’s dead performance makes him look like a superstar.