It is, the saga had spent effort to let us see the mistake of the old Jedi, and how Luke was able to do what they couldn't. The prequel pushed even further on this topic.
Again he might be touched by darkness, but not something like Ren's condition. Even as the young boy he was able to endure all the threatening other than Leia from Vader. Inconsistent here.
Ren hadn't done anything really bad, everything is just "possible future", why would Luke put it into action? Again this is something really low, not even the old Jedi would do, and you are keep saying if Luke didn't fall for that he's gonna become flawless Sue, no.