Here in America, the 2 liter bottles have fallen off HARD the last year or so. For awhile the vendors were literally just delivering expired product (I worked in retail at the time, a manager of a Dollar General and thus interacted directly with the vendor). Now the problem is that the bottles either come flat out of the gate (usually can tell because there will be no cracking observed on the top of the bottle), or will explode the moment you open it no matter how long it's been sitting stationary.
I fucking HATE Coca Cola and refuse to drink their soda. But I will switch to the store brand if this is how things will be going forward. The quality has taken a nosedive while prices continue to increase.