Smeggie's Sadly Rather Short List Of Modern And Relatively Well-Known Manga Artists Who Aren't Embarrassingly Bad At Anatomy And Perspective And Are Therefore Worth Paying Attention To
* Naoki Urasawa (Monster, Pluto, 20th Century Boys)
* Taiyo Matsumoto (Tekkon Kinkreet)
* Kiyohiko Azuma (Azumanga Daioh, Yotsuba&!)
* Junji Ito (Uzumaki, Gyo, Tomie)
* Tsutomu Nihei (BLAME!, Abara, Biomega)
* Iou Kuroda (Sexy Voice and Robo)
* Kentaro Miura (Berserk)
Miura and Nihei start out rather rough (early Berserk and BLAME! volumes must be painful for them to look at now) but their later material is excellent.
Manga artists who I would put on the "entertaining storytellers but have problems with anatomy and/or other things" list would be:
* Hideo Yamamoto (Homunculus)
* Kouta Hirano (Hellsing)
* Shintaro Kago (if you don't know who this guy is already DO NOT GOOGLE HIM because your brain will shoot our of your forehead)
* Miwa Shirow (Dogs and related stories)
and probably lots more that I'm forgetting because it's late.
Note that I've specifically left out the shonen and shojou manga artists and stuck to "adult" manga, not in the porn sense but in the not-about-ninjas-or-schoolgirls sense. Some of them are technically very skilled, but these books tend to be produced under
extreme deadlines, which means that the quality of the art tends to suffer a lot.
If I was to expand this to include American and European comic book artists then I'd be here all night.