If he (Karim Janat) is able to perform on a consistent basis, then it will be good for Afghanistan. Because right now they are lacking quality pace bowlers, with the performance by Naveen ul Haq being very ordinary so far. Janat is more of a medium pace bowler than a tearaway fast bowler, but in the T20 format it is bowlers like him who are more effective.
Now the series is tied 1-1 and the third T20 match (today afternoon) is going to be very decisive. A series victory against one of the best T20 sides in the world would be a huge confidence booster for Afghanistan and it will help them in getting more sponsors, and more importantly additional tours from stronger sides such as India and Australia.