That's a pretty good write-up, Lumi. I've played every American-released Silent Hill, and the only one I really didn't care for was SH4, although I even enjoyed that one on my recent replay, up til the start of the second half, when it just gets tedious.
I actually like Origins a lot. I know I'm in the minority, but I didn't mind that it did nothing new for the series. Sometimes I don't want a series to innovate with every installment; if Castlevania had retreaded SotN a few times on a console around 1998-2002 or so, I would've been totally happy. Silent Hill: Origins captured the atmosphere of SH 1-3 very well, at least in the foggy areas, and that's one of my favorite parts of the series.
One weird thing is that I hated SH2, the first SH I played, the first time I tried it. I had gotten it as a free rental because I had just gotten my PS2 and didn't know which games were good. It was a strange combination of boring and frightening for me. But a year or two after I returned that rental, I had a craving to play it again, and I bought it. Now it's near the top of my favorite games list.
I'll definitely pick up Downpour, but I'm extremely skeptical of the Korn music. Beyond that, I don't know what to expect for the game. It might be great, it might suck. I'm also going to pick up the SH2/SH3 HD collection, but I won't buy it new. It sounds like Konami has treated the voice actors pretty shittily, so I'm not too keen on supporting them since they're largely releasing the compilation as a cheap cash-in.