I'm loving this at the minute. I'm annoyingly stuck playing on the PS5 at the minute due to my PSU dying which is a pain as the PS5 controller is pretty pants in my opinion.
As a note for anyone that bothers with the contracts, the one for damage with arena pick-ups is actually hitting them with the item rather than the gas or fire that comes out. It's best to get the propane tanks that shoot a bit like rockets. The grenade one I'm not sure on as I play a couple of hours last night trying to use just grenades as my damage only went up a few hundred out of the 2k points I needed so not sure if it's the initial explosion that counts for them rather than any AOE that might happen with say the pyro ones.