The Nets, after last night’s 89-74 loss to the Wizards, are now 50 games into their season. And, even with more than 60 percent of play complete, the one thing the Nets are most consistent at is being inconsistent. For a while, the reasoning was this was virtually a brand-new team, with nine new players and 12 who had played less than 20 games last season with the Nets. But the time for that to be used as a valid reason for the seemingly endless string of peaks and valleys the Nets have gone through this season is quickly coming to an end. “There’s only so long you can use that excuse,” said Deron Williams, who was one of the few Nets to play well, finishing with 20 points, six rebounds, five assists and two steals. “The thing is we have to find ways to play better. “We’ve talked about energy and effort a lot this year, and that’s something that should be there. Especially with this team, we should always have effort. We’re a deep team, we have guys that can come in and fill the void if someone goes down ... but there’s no reason why we should be talking about why the effort wasn’t there, why the energy wasn’t there, especially in some of these big games. Maybe this one wasn’t a big game for us, but it should have been.” After the Nets’ bench combined to go 4-for-21 for 13 points in the game, interim coach P.J. Carlesimo made it clear the inconsistent performances could lead to some changes moving forward.