Possibly the best game on PS3 - and without doubt the best strategy game on console.
It's basically the same as the original game with added maps, medals, mecs, armour, items, 2 new enemies, gene boosts and the terrorist organisation Exalt. If you liked the original game, then you will love this as it's the same great formula fleshed out with more options and customisation and a greater variety of locales.
It's still unusual in that the first 3 months of the game are much harder to survive than the next 3 months. I suppose that makes sense with your increasing tech tree, but odd for a video game. As for bugs, I only saw one when accusing a country of harbouring the Exalt base. Iron man is a challenge, but if you do that make sure you backup your save game incase it goes pear shaped.
Highly recommended, 50 hours of pleasure