Then part 2 came out, and I couldn't finish it. Complete and utter garbage, at least in my opinion.
I have heard good things about part 3 being the best of the series, but I never bothered at the time of release. I'm looking forward to the 3DS redo so I can finally give it a go.
I played part 4 on the PS3, and although it was technically impressive, I found this game to just be a very bloated experiance. Fun at times, but just way to much of this, and not enough of that! I personally rated it about an 7 or 8/10. Nowhere near the as good as it was painted to be at the time.
I never really played any of the Acid series on PSP(strategy card games), but the first "Full" Metal gear game on there was poorly reviewed. I do own Peace Walker, but I have not really played it much, but it shows promise.
I know Kojima and Konami keep releasing these games because they are cash cows, but I just find them to be beating a dead horse at this point.