This question is only for ppl who HAVE PLAYED Metal Gear Solid 4!

So i bought MGS4 for my ps3 last week. But ive never played the first 3. But i have seen previews of it and it looks like a really good game!
The kind of games i usually play are just madden or nba 2k. hardly ever play shooting or role playing games. simply because ii loose interest really quickly. but there are some shooters out there that i enjoy playing till the end. such as, Gears Of War, Halo, Resistance, Army Of Two, GTA, those are just some examples of shooting games i like. I dont really like Splinter cell and those kind of stealth games too much cus well, i suck at em and dont have the patience for it lol. but my question is if you have played MGS, tell me if its worth buying? and would i like it??