I liked mgs1 and mgs2. Never played snake eater.
I hated the obscenely long cutscenes. A lot of times during the cutscenes, there’d be something terrific happening and I’d be thinking “yeah, that’d be a fun sequence to play.” Unfortunately, all I got to do was watch. I’ve seen an anime before. I’ve also seen movies. If I want to watch an anime or movie, I’ll do that. If I buy or rent a game, I expect to do more playing than watching.
It seems like they took the sequences of the game that would’ve been the most fun to play through and turned those into cutscenes instead. To the contrary, it seems like they had the most boring parts of the game in as playable sequences. For example, the endless running through empty corridors right before the microwave chamber on outer haven.
I hated the boss battles. The only really satisfying fight in the game was dueling liquid when we both had a metal gear to control. That was fun. Laughing octopus was the best boss character, but the first to get killed. Every boss battle was the same: see boss, boss hides, find boss after a reasonable (or obscenely long time period, like with crying wolf), do some damage, rinse and repeat. The fight against vamp would’ve been incredible, except I only got to half-watch Raiden fight him in split-screen.
Being forced to use infrared/nightvision on the solid eye during certain portions of the game made waiting for a recharge tedious as hell.
Waiting for the alert, then evasion, THEN caution meters to drain if you trigger an alert was irritating. I remember the alert levels dropping faster in previous games.
The AI was horrible. I expected a much more advanced and challenging AI, but the computer just makes insane mistakes all throughout the game. I managed to roll and stab my way through herds of armed soldiers. The fact that the game let me get away with cheesing like that was disappointing. The view range on the enemies was also disappointingly short. When I was in eastern europe shooting soldiers to protect the resistance member, it was insane that they didn’t notice me standing there openly in the middle of the street. I expect more from a next-gen system.
On top of that, a lot of the weapons were needlessly redundant. I finished the game using only the m4 custom (the first rifle), the sniper rifle they give right before fighting crying wolf, and the railgun. However, I picked up about 30 or 40 different guns (and countless special items, of which I used ZERO… the only item I had to use was rations, because I got tired of waiting for his health to recharge). If the game is going to put in tons of weapons and items, I’d like to see more specialized situations where using them is necessary.
Also, they should reward you for using the extra weapons. During the metal gear fight, a friend and I actually found it More difficult if we tried to use all of the metal gear’s weapons to beat the scene. You could just blast through it with the machine gun and it went a lot quicker.
Finally, the game was just plain easy. I picked the second highest difficulty level (because I didn’t want to deal with auto-death on alert like previous games had on highest difficulty). Nothing was particularly challenging except sneaking into outer haven after landing on the deck (and that was only because triggering an alert was basically auto-death). I dropped every boss on the first attempt, including the final boss. I want to earn my hour and a half of cutscenes, not have them handed to me.
That’s all I got off the top of my head, but I’m sure there’s more. 
