In what order should I play the Metal Gear games?

[Nkh3]

I mean the MGS games.

I've played MGS4 3 times and Portable Ops once (Athough I don't really remember it very well).

I'm thinking after watching a MGS twin snakes walkthrough on yt (I've watched half of it),  I'll be buying the MGS HD collection and playing MGS 2, MGS PO, MGS PW, MGS 3 and finally MGS4 once more.

Is this order good?

Any suggestions?

Thanks in advance.