Yeah, I was on easy, and I found it near-impossible to get through to the other side of the first room. I find that hiding behind the forklift is the best option...provided you can get there.
Now, copy and paste time.
I'll say it right now, though, that the additions have a much bigger impact than you think. The aiming in first-person makes a profound difference, stealth is much more of a requirement, enemies are quite difficult even on the easy setting, and the hiding of bodies is also quite a large change. The boss fights are also different this time around. I just finished fighting Psycho Mantis, and I must say that he's quite a bit more fun this time around, if a little on the easy side.
Graphics-wise, everything is much nicer. Aside from a few weak moments, the animation is probably the best I've seen in a game, and while the facial animation isn't the greatest ever, it's far from horrible. Particle effects are also some of the nicest I've seen, and the bump-mapping looks great. There are also many filters used, mainly motion blur. The only gripe I have is the framerate, but even then, it's a small one. Most of the time (I'd guess around 75%) the game runs at a smooth 60 fps, but things tend to get choppy in combat situations, although it never really effects gameplay all that much, and I've never seen it go below 30 fps. These dips tend to also happen more often in outdoor areas, which are also much less frequent. Once you get used to it, you won't even notice the occasional drops.
Sound-wise, things are great. Voice-acting is again top-notch, although some characters' voices have changed (Mei Ling no longer has an accent, for instance), and there are a few awkward pauses. The music is perfect and fits every situation very nicely, although it's not quite as epic as what's seen in Metal Gear Solid 2: Sons of Liberty. The audio quality is also very high, which is nice.
Anyway, I'll probably have something more detailed a bit later. Suffice to say that this is a must-buy, so long as you're not going to be offended by some of the more mature plot elements, as well as the somewhat excessive blood (though this may be turned off).