Yes, there is a debate about Sig's quality over time.
They have changed production methods, moved production overseas, instituted a global supply chain, diversified well outside of core competencies and expertise with new product lines and created entirely new segments, and have had numerous management changes while trying to profit in a highly competitive and fickle market. Now they have to deal with the problem of the German side having to stop exports to the USA, which is a major problem with their high end X-series and 210 legends as well as some other definitive products that set sig apart from the competition.
Any company that even bites off half of what sig has will have quality control issues. Their success will be determined by how they respond to the issues, as well as how innovative they are being.
I think the General concensus is that Sig's worst days are behind them, but they are still not quite sure what they will be as a manufacturer in 2015, or 2025, but they are certainly more defined than what they were in 2010. The quality control debate will go on for a long time, especially as folks are emotionally invested into what they deem to be the "best" by their standards, regardless of the validity of how they arrived at their conclusions. On the other hand, sig will produce a majority of happy customers regardless of what they do. No matter how good they get, there will be plenty of lemons causing batches of sour grapes just due to Sig's volume of sales.