I'm interested to hear how people think hunters are a better solo class than locks.
When leveling you can use glyph of misdirection and basically pull all mobs in the area without ever taking damage yourself. I use the JSHB left click misdirection addon and I chain pull casting mend pet every now and then without ever taking damage myself when doing daily quest or whatever. If you feel you pulled too much and your pet dies, feign death and start over again. You never have to take a single hit of damage.
I've generally found that classes with instants are easier to solo with (hunters + melee) although that could just be my melee bias. In terms of max level soloing, I'm pretty sure hunters are ahead. They were able to do Atramedes solo in Cata but I'm not sure if they can solo any of the 90 bosses yet.