Guys! Guys! We need a little lesson in the art of subtlety. That way the landscaper doesn't seem at fault, and at worst can claim ignorance:
1) When you cut the grass, do it early on the sunniest day possible so as to cause the most trauma to the grass.
2) Lower the blade as far as it will go so that it takes as long as possible for the grass to re-grow, and so that some of the grass is damaged, making it easier for cosmetically less desirable grasses to get established. If you're not exposing some soil, the blade is not low enough!
3) It takes years, but after the cosmetically less desirable grasses are established, you will have to cut the lawn less frequently, but the yard will still look OK from the street, just a little browner.
4) Resist all temptation to mow more than once every two weeks during the peak of the spring grass growth spurt. Surely you can concoct a plausible excuse.
5) Diligence is a bad thing: avoid cutting entire areas of the lawn that don't seem too long. This becomes easier as 3 goes to work. Edging and detailing are your enemies because they are huge time wasters. Only detail the areas that are critical to the reasonably good appearance of your home.
6) Don't slack off too much. If the city sends somebody around to condemn your house as being unfit for human habitation, you're doing it wrong. Too much enthusiasm in the art of shirking can work against you.