I've played a lot against Animar, Soul of Elements morphs and they're even worse there than Kadena (because Animar's a giant pain in the butt to remove) people just forgot about animar cos he's old school Instead of one free per turn and some work, you just get all of them for free forever and then combo off. In Animar's favor they usually combo out so you get a quick death instead of watching the durdles.
Individual morph cards or even a handful as a subtheme are not that bad. When it's all your deck does is abuse the mechanic it's very tiresome. I'm sure there are some cool decks that use it, but my only exposure to actual morph themed decks are Animar and Kadena in many variations. And both are toxic in the extreme.
The decks you played against might be bad, I dunno, or maybe they just had some bad luck? If they're in the game, they're casting a free dude and drawing a card during everyone's turns and then Ixidron'ing the table and flipping all their own crap back up to draw cards, then flipping stuff up and down to counter lock, or picklesing the table, etc. etc.