No, and it sounds like you played the game with apathy and impatience as though you had somewhere better to be so you were just going to play it like a generic action game. Firstly, if you are succeeding by running through shooting everything and are not dying repeatedly, then start a new game and up the difficulty, then go back into it with the mindset to play it like a stealth game, then don't because your starting on a game that's almost all fan service. So much won't make sense, vast amounts of dialog will just be nonsense and as you said pseudo-philosphy, but it's all part of a web that's been intricately span for years. The gameplay was beautifully refined, I appreciated all the changes Kojima made, it improved my control of Snake and really made my extreme run a lot smoother than it was on MGS2. Occaisonally I'd have a little struggle with positioning, and therefore, despite being beautifully refined, it was still hindered under a very unconventional control set up. Ultimately though, if you play from 1 to 4, you have already developed your way of playing and MGS4 really irons out all the decades creases.
I can only implore you to play them from beginning to end, 1 to 4, to really develop and evolve your appreciation of the unique presentation of the games and the utterly insane but ultimately satisfying characters and story. It's much like bourbon, over time your palet forms a relationship, an understanding, and from then on your taste refines and good bourbons definition and subtlties are revealed. Despite all this though, bourbon will be an acquired taste.
I don't know what else to say without being overwhelming and making even less sense. The MGS games are Hideo Kojima's magnum opus, and as a collective are among the best that gaming has to offer. They are startingly unique and refuse to dilute their madness for mass appeal, they're art. As you can probably tell from this thread, there are many diverse and broad ranging opinions on the matter, from blanket loathing to utter adoration, and selective favouritism in between. For those of us who do still enjoy the games, MGS4 was by no means over rated, it was rated highly, and fairly so.