My knight+longsword+shield build has no problem soloing. We should expect some people to see it as a step backward, and some to see it as a step forward, because that is how a balancing patch should feel. If you were OP before, you see a decrease in power, and if you were UP before, you see an increase in power.
If there are entire segments of builds (i.e.: mage) that are not viable as solo, that should be fixed.
But "most people's build got weaker" is exactly what should be expected, because most people choose the OP builds.