The players in the NBA don't start playing hard and really trying until late march when playoff spots or seeding are on the line and the playoffs. Maybe there are great plays of athletes being athletes throughout the season, but anything that really stands out can be seen on highlights somewhere.
It's an 82 game season. Of course there are going to gmes where they are just "off", tired, dealing with nagging injuries, etc.
Imo, the claim that they "don't try" is mostly inaccurate. If a guy is having a bad game, it can look really bad, but it doesn't mean he's not trying. It's just the nature of the game.
As anyone who has played more than a few games at any level of basketball can tell you, a guy can shoot 10 shots in one game and hit 8 of them. Then come out the next game, shoot the same 10 shots from the same place on the floor and only hit 2. It doesn't mean he wasn't trying to hit his shots in that 2nd game, it just means the shots weren't falling.
On another note...you know the outcome of Oregon vs. say Portland St. in football...do you still invest the time to watch the game? Even though you already know what's going to happen?