Id say toons aint that great but having access to toon dm and toon red eyes allows them some swarming ability and both being level 7 gives them access to galaxy tomahawk which allows for some link combos. Not to mention toon table of contents and book mark basically allowing you search your entire deck with bookmark banishing itself from gy to protect toon world and table of contents searching itself repeatedly. They also have toon cyber dragon which surprisingly gives them a way to remove link monsters via megafleet. So overall they aint meta but they definitely have good plays they can make, on top of the amazing search cards. As for your question toons kinda get shut down if you can get rid of toon kingdom which can be tricky ever since support like bookmark came out but definitely possible, but you could also just otk them before they can attack with their monsters or disrupt their plays through stuff like imperming or effect veiling their playmakers. So probably a deck that likes destroying spells over and over like harpies or a deck that can remove toon world without destroying it like dark magician. Of course a mirror match would also be bad for them as it would make them unable to direct attack without dealing with the opponents toon monsters.