Sannam, other than first class matches, how can anyone say that a player is good. A player is judged by his first class matches than given chances in international matches, not other way round. If a player is playing good in first class matches than he should be given plenty of chances in international matches too, as once they get confidence they start scoring runs in international matches too.
If you will study international established players than you will find that over a period of time, average of their first class matches and test matches are similar.