As a publishing scientist, I can completely agree with your assessment. If you have followed anything in science recently, especially the life sciences, then you'll know that we are doing things routinely that were impossible just 10 to 15 years ago, with excellent reliability and reproducibility. Take whole genome sequencing as just one of many examples. There is a lot more science being done around the world now, and a lot more bad science along with it. I don't know of studies that have looked at trends on this, but my guess is that the percentage of bad science probably has not changed too much. But countries like China have entered basic research in a big way, and that means lots more scientists working at more projects. However, the squeeze on scientific funding in places like the US, which has become increasingly difficult to obtain even for very worthwhile projects, has certainly increased pressure on scientists, with negative results in terms of quality and reliability.