That depends on perspective. Relatively it is low. It's half their previous console, the average PlayStation home console sells 112m and it's one of 3 current video game systems on the market that is going to be outsold 2:1 by both of the others.
Whether you compare it to it's peers or it's predecessor, it's low.
Yeah nope the only consoles recently that actually had low install bases where the PS Vita and the Wii U.