Here's a breakdown of the last 10 public CM lobbies I've been in:
>no debuffers
1
>One debuffers
4
>Two debuffers
3
>Three debuffers
2
The majority had anti pace/end skills. If you want to play it safe against debuffers, either make sure you have enough stamina to tank four 1% drains or to pick a style other than pace/end. A McQueen with 1100 stam and 2 golds had a massive lead going into the final straight ended up gassing out around the 60m mark.