It's pretty good. The chart is pretty flat though, which through me off at first. Difficult to tell which notes are hammerons too, especially star notes. Usually just have to guess "Those notes are pretty close together, they're probably hammerons".
Getting used to it though, playing through career on hard (because the unlock all songs cheat disables saving, bloody Harmonix) and 5 starred everything so far apart from one song (can't remember which).
One thing I noticed though is that for some reason it's a lot easier to tell how fast to alt strum when a long string of notes comes down. In GH3 and WT it's basically trial and error. Not sure why.