There have been a few satirical "reviews" of the MW3 plot that have the effect of casting the general plot structure of the Modern Warfare series into relief.
In general, there tends to be some similarities between the overall structure:
- A training sequence where a new soldier or member of a special forces team gets put through their paces (the game's tutorial is usually framed this way)
- One plot thread in which there's a special forces team tracking a bad guy or other criminal mastermind
- Another plot thread in which a group of soldiers is engaged in front-line combat (usually against the Russians)
- A "shock value" scene in which innocents are killed for the sake of upping the dramatic effect of the story (ie, "No Russian" in MW2)
- A major setpiece in which something bad happens to a notable landmark or city (Atomic bomb over Washington, destruction of the Eiffel Tower)
It's really up to you to decide if there's enough overlap to call them derivative, or if you think the changes make it fresh enough to be fun to play through. There's no "right answer" as far as I'm concerned.
Tangential to this is the reuse of gameplay elements. Some of the common gameplay elements generally include:
- A vehicle sequence, usually on rails
- An air support sequence
- A sniper or sniper support sequence
- A 'silenced' or 'sneak' sequence
- Many long hallways and close quarters fights in bombed out locales
- A set of common weapons (M16, AK-47, RPG, etc)
- This building
When it comes to this stuff though, these pretty much characterize any military action game in a modern locale, so I'm not sure how fair it is to say that MW3 is recycling this from MW2; they're all borrowing it from each other.
Focus on what you're good at! If you are decent with most guns breadth is a great way to gain some quick levels. Otherwise, use you're favorite gun and mop up the competition.
Ranking up like a bad ***
Gun Challenges
Its also worth noting that more kills trumps completing challenges almost every time. What I mean by this is don't spend your time on a gun you suck with for experience. The opportunity cost of the kills you didn't get by using a crappy gun greatly outweighs the experience you gain from the challenges. By using a better gun you'll get more kill streaks which in turn gives you more experience and more kill streaks, and kill streaks also give experience!
Kill Streaks
Pick low kill streak rewards (as these provide you with extra experience every time you call them in) and try and get these often (hardline?). Keep in mind that getting an osprey gunner, while awesome provides THE SAME AMOUNT of experience as calling in a uav. By using low achievable kill streaks you will gain more experience by using the kill streak, gain more experience by challenges for the kill streak, and gain more experience by the kills you get when your kill streaks are up! Most of this game is about snowballing your momentum.
Equipment
One of the most often over looked ways of gaining experience. Not utilizing your equipment is bottom line a wasted opportunity. Don't think of throwing that flash bang grenade as -wasted- think of it as utilized. Every time you die with out throwing your flashbang you have wasted the opportunity to potentially save your life, potentially get a kill, and work on your equipment challenges. Wasted equipment is sad equipment. Utilized equipment is just one more layer of the snowball (see above)
Keeping these things in mind will help you level up faster, but its worth reiterating the most important part of this description. If you are using crappy perks and crappy guns to get challenges YOU WILL LOSE EXPERIENCE. The smarter you play (low kill streaks, great perks, great gun) the more kills you'll get which will lead to more kill streaks which will lead to more challenges which will lead to more experience!
Thesis
Now this seemed like a long detour to the point, but here it is. If you play better you will level up faster.
As far as an 'optimum route' this really depends on how you play. Ever had a friend argue with you for hours about how 'their xyz' is always the best but it just doesn't work for you? You and I will be significantly better with different guns and different perks, but you wont find whats 'optimized' for you until you try it. Try it out on a 'test' class while you get a feel for which guns and perk choices fit your play style best. Want to try a new gun? Go for it. Just make sure you always dedicate a class to something you know you can kick ass with. That will give you a fall back while you investigate which perks and guns are good for you!
Hope this helps
Best Answer
I assume you mean the message : "Some players may find some game content in one of the missions disturbing or offensive"
I don't believe you can change your decision on the same play through of the game. I know from personal experience that if you start another play through you will get asked again. Since it only effects one non-interactive cutscene, you may also consider just watching it on YouTube.