It won't be very difficult if you start rating the limited overs sides.
ODI ranking IMO:
1. India
2. Bangladesh
3. Pakistan
4. Sri Lanka
But.. Tests become interesting. Pakistan is the only team that has drawn a full overseas tour, and also have been very bad in others.
India hasn't been able to do anything of note overseas, and they've had many more matches/chances to do so as well.
Asia Test ranking:
1. Pakistan
2. India
3. Bangladesh
4. Sri Lanka
How would you rate the sides?
ODI ranking IMO:
1. India
2. Bangladesh
3. Pakistan
4. Sri Lanka
But.. Tests become interesting. Pakistan is the only team that has drawn a full overseas tour, and also have been very bad in others.
India hasn't been able to do anything of note overseas, and they've had many more matches/chances to do so as well.
Asia Test ranking:
1. Pakistan
2. India
3. Bangladesh
4. Sri Lanka
How would you rate the sides?