City and title rivals Liverpool have easily outscored Jose Mourinho's side this season, with Pellegrini bemoaning their more cautious style of play.
Liverpool have scored 90 league goals in 33 games this season, with City notching up 84 from 31 games.
In contrast, Chelsea have struck just 65 times in their 33 matches and Pellegrini feels the team that wins the title should offer more entertainment than that.
"It would be very disappointing, for football, for the fans, for everyone," he said.
"I think that the most attractive football, the more goals you can score, should be rewarded.
"I'm not saying it's not important to defend very well. Football is attacking and defending. But I think that big teams must play as big teams."
Pellegrini also took a swipe at Mourinho and Liverpool boss Brendon Rodgers for repeatedly refusing to admit their teams are serious contenders for the crown.
"I don't think it's true. Maybe they are covering for if they don't win the title," the Chilean said of his counterparts' cautious approach to talking up their title challenges.
"But really, I don't think both of the managers feel that that is the reality. This profession is about pressure.
"I can't believe being in this profession without pressure. And more important, when you manage important teams, is to have the chance to win the title.
"I don't know what their players think, but I'm sure if I said to my players we don't have any pressure to win, I don't think that would work.
"I don't think the players agree - not important players - that they don't have a chance of winning the title. Not when they are one point or two points off the top. When they are 10 points away, maybe.
"But I don't think Chelsea players or Liverpool players believe they don't have pressure to win the title."
Watch the head-to-head clash between title contenders Liverpool and Manchester City on Sky 3D and Sky Sports 1 from 12:30pm today.