All VIZ Media titles, whaddaya know. (Dems just da breaks this time around; no offense intended.)
D.Gray-man Vols. 1-3: Well, I'll lay odds that Hoshino Katsura is a fan of Tim Burton's The Nightmare Before Christmas; it's definitely got that sort of look to it. But while the art is pleasurably gorgeous and Komui is deliciously perverse (yeah, I could see myself becoming like that if I let myself go), I don't see this series exceeding its commercial imperative. Which is a shame, really.
Monster Vols. 4-13: Huh. I wonder if Urasawa had MW on the brain when he came up with Johan? Anyway, I find this series to be most amenable in large doses--that way I don't forget all those itty-bitty plot details, which are notably not recapped as the series progresses, in-between installments. What's most remarkable about this series is how effortlessly literate it is--it's so well-constructed and well-paced that you're tricked into thinking it all came naturally. But that's not so, I'm sure, and that speaks well for the creator; it ain't easy to make something so hard to accomplish look so easy.
Muhyo & Roji's Bureau of Supernatural Investigation Vols. 1-2: Was Weekly Shounen Jump having a horror renaissance in the early 00s or something? Whatever. This series didn't do much at all for me, other than give me occasional pause at the creepy cartoon visuals (which in Nishi's case didn't look especially Burton-ish). If you can read it for free, go for it, but it wasn't worth anywhere near $7.99 a pop.