I don't read much manga. It's hard to find the time~ I've read some though.
The first I read was the Princess Ai manga in 2005, closely followed by KH. Tokyopop was pretty great~
I've read the Air manga, some of the OreImo manga, and I read the OreKou manga for a while but got bored waiting for new chapters...
I'm up-to-date with Hamatora, reading through Kagerou Days as it progresses, and I'm keeping up with the Sarishinohara translation. Oh, I need to catch up on Hibiki's Magic too.
High Score Girl is fun too. Reminds me of One-Punch Man in a way
I don't feel too strongly about any of those though. The manga I really focus on are of the same two or three genres:
Wandering Son was really good. Planning to re-read it soon actually~ The anime was good too.
Reversible! is different but similar. I enjoy it a lot, but not as much as Wandering Son.
Bokura no Hentai is suffering a bit from the translation process right now It doesn't have a stable schedule. I reeeaaally like it though, even if it's not very popular~ Definitely not enough demand for it.
Kodomo no Jikan was a really interesting read. Picked it up in 2009 and pretty much grew up at the same pace as the characters. I actually don't remember how it ended very well, but I remember being satisfied by it, so it must have been good. The anime was... messy in places, but it wasn't bad. It just forgot to include things~
Usagi Drop was like 2 different manga. You go from the struggles of a single parent in an otherwise peaceful life, to the over-the-top drama that comes with hitting the teenage years. The transition was well-timed though, so it worked. I've heard a lot of people hate on the manga, but the criticisms didn't start showing up until after the manga ended, so I'm gonna say that's the anime's fault.
KamiNomi. When it finally ended I was reaaallly sad! I followed it for a quarter of my life! Probably my favorite series~
DMWL was really good too. It has flaws, but it's my type of story. Kinda the typical dark shounen story... but strangely a rare type of manga to come across. The anime adaption was disappointing, but the soundtrack was great, so that's nice.
I'll be picking up Tokyo Ghoul when Root A finishes. I know they will both end up spoiling each other, and there'll be F/SN-F/Z style arguments about it, but the anime has a cool opening so I'm going with that first.
Oh, and this recently showed up on reddit so I picked it up - Dating a Team Magma Grunt. It's a Manhwa, but whatever~ I couldn't care less about R/S/E, but this is the cutest little thing ever~!
I didn't really like the KH manga. Wasn't very entertaining...