He bowls into the wicket at a reasonable (if not express) pace, and bowls consistently in good areas. He moves the ball both in the air and off the seam.
I had the privilege to watch him make his test debut, and he looked like a very good prospect.
He was the top wicket taker in the Sheffield Shield in 2011/12 with 53 wickets and was high up the table again in 2012/13 despite only playing in 6 matches.
He did all this at with a very good average and strike rate. Part of those good figures is due to playing for Tasmania, and hence getting to play half his cricket on the Bellerive Oval, where he has taken 42 wickets at 16.19. However there are only 3 grounds where he averages more than 30 at, and at all of these he has only played one match.
It is the nature of medium-fast bowlers to be quite reliant on the pitch, and Bird has not found the going quite as easy in the matches he's played in England for either Australia A or the Australians.
However there are still some very good signs about his ability as a bowler. He's been remarkably consistent at the start of his career, here's a graph of his career so far:
When he ran in to bowl, he looks a little like Charl Langeveldt at first, but the he opens up and his delivery stride is reminiscent of another tall medium-fast bowler hailing from New South Wales, Glenn McGrath.
While Bird has brushed off comparisons, a glance at the early careers of both is quite interesting. Bird has only bowled in 39 first class innings, so I've isolated the first 39 innings for McGrath:
Summarised it looks like this:
That's not to say that Bird is going to be better than McGrath, the standard of batting in Australian domestic cricket when McGrath debuted was phenomenal, particularly in comparison to now, but it is promising. If he gets a bowl at the English in the Ashes, it will be very interesting to see how he goes.