It is hard to decide on this issue, really.
I can see the merits of what Richard and a couple of others have said, reg. how it isn't different from the odd FC game against strong opposition etc. At the same time, I do think that there cannot be any REAL line deeming what is test class and what isn't, because weak sides have existed all along. India, away from home for a while in the early and mid 90s were just a "run in and pick up ur wickets" side, apart from Sachin Tendulkar... Does it mean bowling performances against them don't count? Windies have been bad in the past, so have New Zealand, India, Pakistan, Sri Lanka and all other countries. Heck, even Australia were poor for a while in the mid 80s.
And while there are specific matches when Bangladesh and Zim have played as bad as club cricketers, they have also done well on occassions. I prefer to take it match by match, really, as I do with the other sides. India didn't exactly face a very tough attack in 2003/2004 in Australia, did they?