But this is exactly my point. Against trash critters defense is fine. Against tough critters, EBs, and AVs not so much. And Tough is only S/L resistance. If you're getting hit with something else it's not helping. While SR has nice DDR, a room full of +4/x8 Cimerorans are gonna slice right thru you. Numbers on paper are great, but they don't tell the entire story. There's a reason why Shield, Rad, Bio, and Invul are at the top of the list and SR isn't. I mean, you can test all this yourself. Hop on the test server and make a bunch of Scrappers with the same primary but different secondaries. Boost them to 50, kit yourself out with even-level SOs, set the slider to +4/x8 w/AV and take on different types of critters, AVs, and GMs and see who lasts the longest on average.