I've never outright reject it but stated "wouldn't recommend". If people have other opinions, it's fine as like
LuffyPSP said, now it's a choice. And I kinda partially agree on
kllam statement.
Before this, I've recommended Nexus phone to my peeps and relatives (some already have N5), but they always, ALWAYS complain to me like the battery is bad, camera sucks, lacks of this and that (features). So I told them that they can customize it, have better battery life, (blah blah), with root and stuff. And they said no cause of warranty, this and that, and so I got bored and recommend other phones.
I'll still stick to my opinion that I "wouldn't recommend" to consumers who do not plan to root/flash (flash not limited to roms, it can be mods as well). However, if you feel that it's okay, then it's okay.
Hey, I'm not forcing anyone here to accept anything. It's my personal opinion and it's yours

If do not agree to mine, then it's fine as well