I've just finished Sin Emergence myself. Finished it in 3 sittings, but it took me at least 6 hours and probably more, but I used that graph thing to make sure I was exploring pretty much everything.
Some of the AI is pretty average, but there's a few very, very fun firefights to be had in there, depending on how you aproach them.
Some glaring clipping errors. Not being able to pick things up and having to either shoot things away from the wall with the magnum, or use the melee feature and bash them away so you could get at them. Those fucking grenades in the drink machine. I'm standing there, pushing enter over and over cause I need the health. Freakin' live grenades come out nearly every fourth time, but you can't see them cause of the clipping, so you explode and die.... several times... and you get really friggin' annoyed!
Whoever did the story for this, absolutely worshipped Soldier Of Fortune 2. If you've played both, this will be obvious to anyone, I'm sure.
Apart from being murdered several times by a Cola machine, I loved this game. The death animations are hilarious for the flying dudes and the comments they make when on fire had me in laughing hard. Lots of things in this had me laughing, actually. The dynamic difficulty is pretty damn cool, too. Near the end of the game, being able to look back to the right of the monorail and see where you started off and how far you've come was pretty cool, too.
I think it was Beamer who coined the term 'Meatshield™' for Jessica and it's certainly advice worth adhering to for some of the tougher fights.
Definitely a Ritual game. I'll be in line for the next installment, but I want HDR and a discount for having bought the first. There's also a couple of places in there where having those goddamn idiots known as teammates from HL2 would have really worked wonders in SIN, too.