I've always like RD, not only does he do a great job of bringing his roles to believable life but he seems like a real nice guy too. And, yea, we all hope his drug problems are in the past because it would be a huge downer if he had to go back to prison or if he exited life.
As far as I'm concerned, Jeremy Brett is the ultimate Holmes--there was just something battered and crotchety about Brett's Holmes that suited the role so well, when I read the Holmes series that's how I pictured Holmes (ok, maybe just slightly thinner but the face and attitude was on point). From the trailer I just watched, the Holmes that Downey plays has more sex appeal and has more of a sense of humor, less dictatorial. And Jude Law is a completely different Watson then the one in the books, more modern thinking, younger. I'm not sure I'll like this sexier duo though--I kind of liked that Holmes had a stilted attitude about the intelligence of women because it fit the era he existed in and that there were only a few women Holmes actually came to admire (which is as close to love or, yikes, physical contact he had with women). I would have preferred that Holmes kept aloof of all the male-female love-sex things in this film too but that isn't to be. Not sure all the special affects and "super-human" things in this film are going to feel right either since one of the things Holmes is known for is his intelligence, his ability to deduce correctly and not fall back on physical aggression to overcome evil. This film sort of negates that. But I'm going to go see it anyway.