This is funny, but I always got the implication from the books that there had been people trying out for Seeker, but none of them had been very good. So McGonagall stepped in because she loves her House team.
The Marauders were definitely McGonagall's favorite students, especially James. Dude may have been a bit arrogant, but he was brilliant at the two things McGonagall loved most - Quidditch and Transfiguration.
That will be a sad day. But my children will cry with me. Joanne K. Rowling was my childhood, and I will cry- literally cry- on the day that she dies, because I think a piece of my heart will die too.<<I'm literally crying rn