This sounds pretty good, doesn't it? End of agricultural subsidies, free access to rich markets for poor countries! Of course, the truth, as always, is in the fine print or the background facts:

Agricultural subsidies
Export subsidies represent only a small fraction of farm support.
In the case of EU farm policy, export support represents only 5% of the total budget (EUR 2.5bn out of close to EUR 40bn annually). In the case of US cotton subsidies, direct export support is only $250m, vs $4bn of domestic subsidies annually. For some products, the export subsidies are a big part of the problem, so their elimination is a progress of sorts, but it is a much smaller progress than will be claimed, and a much smaller sacrifice than the farmers will scream.

Duty free access to rich world markets
Again, 97% of the goods have free access is good, but that hides the fact that 3% will not, and of course, these 3% will be - coincidence! - precisely those products where developing countries have the most competitive advantage, or the largest industrial capacity, and thuse their exclusion will prevent them from reaping the benefits of the deal.

Another thing that must be noted is that a number of the poorest countries already had a preferential access to the European market (again, with some blatant exclusions), so that deal, by extending that openness to all countries, will actually be tough on the poorest countries as they have to compete with less poor developing countries. In the agricultural sector, in particular, any general opening up of the European market will tend to favor the big competitive countries like Australia, Brasil or Argentina (and in these countries, the largest, most competitive farms geared to export, not the small farms) against the poorest countries.

Non farm aspects
This was seen as the quid pro quo by the EU and the US: the opening up of their agriculture sectors would be matched by an opening up of the industrial and service sectors of the developing world. There is little information on whether this has happened.

In any case, the tragedy is that what would help developing countries most is to trade with each other, not just with the rich world, and there, obstacles are as great as ever. It's not just the tariffs and import quotas, but also the bureaucratic requirements (permits, licenses, incompatible standards, contradictory requirements of local authorities) which are obstacles to trade and to prosperity. In a number of countries, those same obstacles work inside the country to make economic activity and development a headache for all - except for the well-placed officials and politicians which take their dime and what activity that does take place.