As a fan of the games I had high hopes for it, I wanted it to be good enough that it may one day become a real series maybe 20 something episodes long due to the length of the chapters of the games or it'll probably do well with just the popular 12-13 episode trend anime series now days seem to be having. I wasn't expecting it to be faithful because of it's length and I wasn't expecting it to be a rushed summarized version of the games ether (thank God it isn't). For what it's worth it may confuse those who have never played the games (I've never read the manga nor I care for it). It may also attract people to get the games (which are in English on PSN for PSP/Vita).
Some Pros
-It has it's own original story and it doesn't spoil the game if you haven't played it before (ending, most deaths, etc.).
-May or may not interest people to get the games after watching.
-Music from the games are used.
Some Cons
-In Japan they had this in the cinema but it was all together. From start to finish this felt more of a film than a anime and it acts like a film than a anime. It would have made more sense to release this as the theatrical cut. Its a minor flaw for me but thats it.
-With a 2 hour run in total it doesn't give you enough time to connect with the characters if you never played the games.
-There are inside jokes here and there newcomers wont understand.
-The art style compared to the games is a little plain like if it was made in 2006 or 2008. I dont really find this an issue but it kinda has an excuse because it's not a real series.
