I must say it is a very good game, though it does have its problems. The campaign is fantastic, but the vehicle sections are a bit meh apart from the last one (am I the only one who had little problems with the driving through the ice. I played it on insane without dieing in that part, and the reavers and turrets were a much greater thread), and I hated act 3, but it has really good pacing, and if you spent slightly less time underground, I would be much happier. Anyway, I though Chapter 5 was just sublime, even though it did comprise little "traditional" gameplay.
As for MP, despite is making me so incredibly angry, I did manage to play for over a day, though I stopped as soon as I got the online achievements. It is just so buggy and glitchy, and I still can't understand how someone can punch me while a have a chainsaw revving, and the hit regocntion and shotgun damage just seem incredibly inconsistent
Horde I consider separate from the MP, because it is fun, really fun and one of the best game modes that I have ever played. I got to level 45 once with 3 other sensible guys on avalanche, just holding up one point and it was wonderful, though to get to level 50, I did end up doing a 3 player private match
I must say my enjoyment of this game has increased because of achievements, I certainly would not have got the same out of it without spending all that time, and now the only one I have left is Seriously 2.0 (only 40k kills to go!)
