Yeah, but then at least in that series he was a capable Detective. Thusfar, under Dini he hasn't shown himself intelligent enough to figure out one crime, and has spent most of his time being jobbed either by Batman or by simple civilians. Dini could have made him into a respectable rival for Batman; instead, he turned him into a laughable non-villain, who does little more in the series than annoy everyone around him; essentially, Batman's Geraldo Rivera.
Making Riddler into a respectable rival would have involved two things; one, actually respecting the character by making him a legitmately brillaint decipher of puzzles and quizes, and two, actually make him a rival to Batman. Not some celebrity PI who not once stood a chance in outsmarting Batman.
GU was, next to Detective, actually better for the character because it showed that he and Penguin - who also suffers under Dini, becoming a slightly uglier version of Max Bialystock - share a bond of friendship and respect, like the Flash Rogues, even if it is slight. Similarly, in TRINITY he was shown to at least have the intelligence to go into hiding in order to prove his innocence from crimes perpetrated by Enigma. Had Dini been writing, the story would have ended with him being dragged into jail, comically protesting his innocence.