Given a careful measured approach, bomber formations are pretty easy to take out. I think we can all agree to that. But I think the crux of the issue is that the way that the game works now, it is very difficult to make that careful measured approach BEFORE the bombers have the chance to deliver their payoad. Anybody can take the buffs out AFTER they have dropped, no hurry at that point.
All that said, I'm not certain what the solution would be. The problem is that bombers aren't used in this game like they were in real life. They don't travel for hundreds of miles, possibly passing over spotters along the way. With the short warning distances in AH2, there just simply isn't time to get into position, most of the time.
Really, the flaw is more in the way that the maps are designed and the way that airfields are employed currently in game.
What if aircraft had to pass over several "spotter" locations on the way to any Base? Maybe the Bombers would be visible on the map as long as they were over head of the spotter. The spotter could even provide altitude and aircraft and directional type info. But as soon as the planes are out of line of sight, the info vanishes from the map.
Something like this might give enough warning that a pilot paying attention to the spotter info well enough to get an earlier warning might have a better chance of intercepting the bombers.
It might also have the added benefit of discouraging NOE missions into undefended bases.
Just a thought.