If you use FWE mod it defaults to make it so that gun skills only increase accuracy of your weapons. The vanilla game splits it so 50% increases accuracy 50% damage. This means at level 100 of a specific gun skill your weapon will be twice as accurate out of vats compared to vanilla and it makes sniping and alike very fun from great distances where as before I had found that despite having a scope my gun was still very inaccurate. So if you wanted it to keep a FPS person happy I would consider it.
Although there is a lot bundled in with FWE, though almost all of it can be turned back to vanilla settings. It appears one of the more annoying changes is to have made companions not have unlimited ammo on their default weapon and to not regenerate health after a battle. Either that or my game is just buggered.
Which brings me onto my next point, the game is not stable. Even without modding the game suffered just like oblivion from instability issues. It's well documented and there are loads of "cures" online but they all seem specific to a few people and oftern don't seem to fix it. Only recently I had to use the console to teleporting my self to a npc in the main quest because the entire south west part of the map caused instant crashs. After teleporting there it seems to have possibly been fixed. This could be due to the mods or just another random screw up.
I am however very much enjoying the game with MMM and FWE mod's installed too. The vanilla game I found a bit lacking. After this im going on to oblivion as well, i've never got very far into that game as i've always found it lacking even with mods but im going to give MMM for oblivion a try.
Lol, what a load of rubbish. A new player does not 'nearly finish' the main storyline in 5 hours (besides, how would you know when you don't have a clue what the main storyline is?) even if he goes directly for every primary quest and ignores the other 99% of the game.
The only real reason to progress the main storyline is that the Enclave will also start appearing later into it.
Thats impossible. You'd get utterly destroyed being that lower level in some places surely? Though i've not played the vanilla too far down the main story and my mods make the game a lot harder. Not to menchen that I think there must be 5 hours of just talking and walking at least in the main quest let alone actually killing things etc.
:EDIT:
Just relised I quoted the wrong person. O well, sure people can work it out.
..and you will love it! 
