Greetings,
I thought I share what I think are just sloppy and lazily constructed alternate timelines made for various medias. Two come to mind...
Rex Mundi - this is a shame, because I heard good things about this supernatural/Da Vinci Code-ish comic book series. But the divergence point for this world is that Martin Luther was assassinated by the Church before the Reformation could really take hold; however, Europe looks too much like OTL 1900s Europe and there is even a Confederate States of America and Federal Republic of America in this timeline. How can 19th century United States exist in a world where protestantism didn't take hold in England?
Code Geass - This is everywhere on the map. There are three distinct divergences; first when the Britons repelled the Roman Empire, second when Elizabeth I had a son to call an heir, and third when the American Revolution was crushed by the British. Then there's Napoleon chasing the absolutist British royal family from the British Isles to the Americas, or "Britannia". This seems rather implausible. But not as much as Ben Franklin being bribed with an earldom; it doesn't matter what he's like in real life, he would never be that big of a douche.
What you you call sloppy AUs?
Well, to be honest with you, even a few mostly decent TLs like DoD, Sobel's For Want of a Nail(one of my personal favorites, btw), Stirling's Draka series, and Turtledove's TL-191 and Worldwar series definitely have some areas that really could have been done a lot better, IMHO(especially TL-191, the Draka, and DoD to a lesser extent but there's others, too).
However, though, I definitely agree with the OP re: Code Geass-Fun concept, but execution was flawed at best, and probably the worst of all the examples I've listed thus far in that regard; it really IS kinda sloppy.....even Stirling did better, TBH.
And don't get me started on the huge numbers of completely slap-dash TLs on places like the AltHistory Wikia, and even on YouTube, too(don't believe me? Do a search sometime)
Edit: Now that I think of it, the universe of "CSA: the Movie" counts, too: no way could the C.S.A. have conquered the entire north, then Mexico, and THEN most of
Central & South America, and have been able to survive to the present day, especially with slavery never having been phased out. Kevin Willmott's concept was an interesting one but not that plausible when it comes down to it; Turtledove's "Southern Victory" was much better by far.
Also, for those who have some time to kill, you can watch it all on YouTube, if you'd like. Here:
CSA: The Movie