He's been a long way short of brilliant. The fact the middle order has been so ordinary makes his contributions look better than they are. Don't get me wrong, he's gone better than I thought he was capable of, but he is no where near the top half dozen openers in test cricket. There have been some brilliant performances by openers in the last two years. Watson has just been solid.
Since Nov 08:
Sehwag - 19 tests, 1818 runs at 60.60 with 7 hundreds
Gambhir - 15 tests, 1381 runs at 57.54 with 6 hundreds
Dilshan - 15 tests, 1373 runs at 57.20 with 6 hundreds
Smith - 17 tests, 1409 runs at 56.36 with 5 hundreds
Gayle - 15 tests, 1203 runs at 52.30 with 5 hundreds
Katich - 24 tests, 2163 runs at 51.50 with 5 hundreds
Strauss - 24 tests, 1834 runs at 48.26 with 6 hundreds
Watson - 15 tests, 1267 runs at 46.92 with 2 hundreds
Cook - 26 tests, 1791 runs at 42.64 with 6 hundreds