He's streaky and a risk taker. The Cards offense in general follows suit. They score in bunches and go through droughts. The finger he dislocated last year definitely affected his accuracy at the end of the season, though, and he and the Cardinals have come out sputtering so far this year. It's pretty much in character for them.
The biggest difference beginning with last year is the defense really misses Todd Bowles and has lacked the pass rush it once had, though Chandler Jones could help change that. In fact, as I type this they get a sack and Jones recovers the fumble. They are also weak at CB outside of Peterson.
