Well if your that type of quirky gamer who really gets into stats and item crafting and all that stuff. Yeah, you may find PW enjoyable.
But I hate all that stuff.
I loathe PW. Yes, the levels are small and the ai seemingly more dumb then the average MG. So in the PSP version since aiming was a pain, I could easily just run up and CQC people like it was nothing. So, the stealth is quite weak in this one. I'm quite sure in HD version thanks to the aiming being better, you could just stay in one place and shoot the idiotic guards and then move on. Hell, I was able to do that in many a places in the PSP version.
And then there's the boss battles. Beyond the fact that the lack the personality of past MGS bosses(well they are vehicles) they are just kind of boring and very tedious. If you don't do co-op, you have bossess that are'nt balanced. So you'll be shooting a lot of missles and dropping a lot of supply beacons and reapting the process over and over. Bossess just take forever to kill and are'nt exciting. They are'nt diffuclit, just tedious.
But you could say "just get better gear". It's true, but then you have to spend your time doing the bonus missions over and over. So now MGS has become a game where you grind and wait for the troops you collect to make better weapons. So now you're going to have to put in a lot more time then you would for a normal MGS game where yes you can go and find bonus things, but you didn't have to say constantly refight a boss to get that shinny new Mk22 or whatever. It just wasn't fun to me at all. You're better off importing someone elses completed save.
If you do that, you won't have to worry about the bossess and what not. Which then become not exactly fun, but not a bother. You then can just play through the main single player and you'll have a pretty meh stealth game.