Picked this up the other day and it's a lot of fun. Haven't played a GG since...something on the PS2. I'm impressed by the single player content here as well as the nice tutorial. I am absolutely terrible at fighting games though. Is GG considered difficult to learn?
It can be difficult, but you can do pretty well even with basics, and there are a ton of resources out there for learning the game. If you're not already aware of it, Novriltataki's guilty gear crash course series is really good for getting started. Even if the early episodes seem stupidly simple, the series quickly progresses to more advanced stuff you may not be aware of.