The way you make these statements makes it sound like you believe that as a rule Love doesn't stay in front of people, doesn't contest shots, and doesn't give any effort.
I'm saying none of those things is true. I'm saying Love does do all of those things. I'm not saying that he is perfect in any of those things, he does let some things go when he decides that particular possession is a lost cause because he can't get to the right spot.
How can you deny that the majority of the time, Love tries to meet his guy early and keep him on the perimeter, and he does put up strong resistance, and he actually does get a solid number of one on one stops?
Every player in the NBA gets beat one on one. Even Lebron, JR, Shump, TT all get beat one on one. You act like Love is the only one this ever happens to, when he is usually defending longer and more athletic players to start with. I would say if anything Love over-achieves by bodying up when he can, by staying solid in his positioning, and by having active hands in traffic. He's never going to out jump or outreach longer players and he's never going to close out on lightning quick perimeter players who blow by their man when Love has to come from any distance.
To me the biggest problem is when he leaves his man to help. To me it looks like, as a team, our bigs are unclear as to when they should go help, how soon, and who is going to cover for them if they leave their man.
You constantly attack Love's defense and make blanket statements as though he is the main problem. The way I see it, Love is absolutely capable and willing to do his share but the team defense as a whole must improve for each player including Love to be able to do their part.