By February, I plan to (if I get around to it) (re)play the series in more or less the following order, leading up to Requiem...
Zero
1 Remake
2 Remake
3 Remake
Outbreak File 1 & 2 (online)
4 Remake
7
8
Likely skipping CVX because I play on Steam and never bothered with emulation for a game before - aside for Outbreak.
Skipping 5 and 6 because they're still trash wannabe Resident Evil installments and I'm still hoping for a complete or heavy retcon for their inevitable remakes. I will continue to skip them for repeat series playthroughs, pretending they do not exist, until the lore and gameplay experience is eventually "fixed." As they are currently, these are not immersive survival horror games with respectable story direction and characterization.
Skipping Revelations 1 and 2 for the same reason above I'm skipping 5 and 6. Revelations is the afterbirth of 5 and 6, coming out of the same terrible era for Resident Evil. It's hopeful to see that Capcom appears to be shelving the Revelations games completely and focusing on Outbreak for moving the series forward - the latter being the actual worthy Resident Evil spinoff with gameplay and lore that meets the standards of the earlier titles.
Wasn't fond of the writing for the story of 8, but I would consider some of the narrative redeemable.
Here's hoping 9 recaptures the quality of the best remakes thus far and the incredible 7 - far exceeding it.
Time will tell!