How can WR's look good when your O is 32nd passing the ball and 32nd in TD passes? Nobody fears the ball getting thrown over their head when playing the Rams right now.
Do the WR's hold some responsibility? Sure they do...but the QB play and the Oline play do as well. Add in Coaching and scheme and the Rams just need to get better.
The Rams have simply been awful passing the ball, get a QB who can make plays and watch them make those around them better players.
Teams with good to great QBs usually win and look good, teams lacking good QBs struggle to win and to pass the ball.
You cant play if you have Clemens, Hill and Foles and Keenum leading the charge for you. You can compete and be average because of other talent on the team but the team will hardly ever compete for the playoffs and winning playoff games and or Superbowls.