Atherton actually had just 1 bad series against WI and Aus when fit and when established as a good Test player. These came in 1997 and 1998.
Nonsense. If he was not fit, then he was robbing England's chances by playing. That itself is a huge crime. And the basis for establishing his ability as test played is bollocks. How many series
Vs Aus
1989 - Avg 18
1990/91 - Avg 31
1993 - 46
1994/95 - 40
1997 - 23
98-99 - 14
01 - 22
No 100s since 90-91 (Only 100). Had he been in any other team, he'd never be selected after 97. And by no means 46 is an exceptional average, it is just good. And there ends it
Vs WI
1991 - 5 tests, avg 9
1993-94 - 5 tests, avg 56
1995 - 6 tests, avg 40
1997-98 - 6 tests, avg 18
2000 - 5 tests, avg 35
Again 1 very good series in 1993-94 (Although 1 of the 2 100s he made was on the infamous road at Antigue where Lara made his 375)
Atherton simply faced Australia before he was Test-class once (2 Tests in 1989), after he ceased to be Test-class once (5 Tests in 2001; he also faced SL and Pak in this time and did poorly), and when he was woefully unfit once (1998/99 - he also faced Zimbabwe in 1996/97 in a similar condition and did similarly woefully, proving that the calibre of attack was completely irrelevant and the only reason for his poor performance was lack of fitness). This disguises the fact that there were 21 Tests in which he actually performed perfectly respectably against Australia.
Not at all excuses for poor performance. Did he himself knew he was not test class when called up? Could he have said "No" at that point? No, so your argument is not valid
Atherton played one hell of a lot of superb knocks against West Indies. The only series that went by without him playing one at the very least was 1997.
Hell of knocks? Apart from 2 100s in Windies, one of them on a road, and another on a first day surface.
Another 100 was at Trent Bridge, where it was again on a first day pitch, and on a good pitch that (Both teams made 400+ in the first dig) against an attack which had Walsh, Benjamin, Bish and Dhanraj.
The last 100 however was a classic which helped England win the test at Oval, although it may argued that Walsh and Ambrose were past their prime.