It's developed its characters, both core and supporting, a lot more subtly and richly than Sherlock has room for in its brief seasons.
Nope.
Doing it longer, or more repetitiously, doesn't equal doing it better.
Nope. Gender-switching characters doesn't earn automatic points.And Elementary is well ahead of many American procedurals, and a long way ahead of Sherlock, in its handling of diversity and gender.
In-jokes don't address the generic style, plotting and-by-the-numbers characters introduced to drive the stories, which is what matters. You could pitch this show with the same stories you'd take into any of the CSIs.And it's not generic, because it has lots of marvelous little Easter eggs, homages, quotes, and appropriations from the Holmes canon...