The Merseysiders scored just 57 goals last term - compared to the 83 netted by champions Manchester United.
Benitez said: "Defensively the team was good but really we wanted to attack. We were having a lot of chances, crosses and shots - more than anyone.
"But we needed to improve. Maybe with these players the crossing will be better and also the finishing.
"In Valencia we had three or four players all of whom could score 10 or 15 goals a season.
"If you have a player who can score 20 goals a year it's good but he could get injured and other teams know he is the only one who can score.
"It's then easier for the opposition to control. When your team attacks I prefer to have four or five players getting to the box."
Benitez is excited about the variety Babel and Benayoun will give him as he looks to challenge for silverware next term.
He added: "Both can play as wingers or second strikers - that's important because you need to be able to change your plan or formation.
"They have pace and ability to beat players in wide positions - things we didn't have before."