They are corny, and while watching Supergirl Season 4 I remember putting on Nolan's Batman trilogy and noticing the huge gap in writing quality, subtlety of the themes, complexity of the plot, etc.
Yet, I still enjoy them. I spend half the time screaming at my screen when Flash can move at near-light-speed for hours but is overwhelmed by 5 randos, etc. But it doesn't prevent me from routing for one or the other character and getting out with real emotions once in a while.
One thing I'd say tho... it takes a looong time to get out of there repetitiveness. Arrow was basically 4 seasons of "I lie to protect you but I'm blaming you for lying to me" with every single character... Main cast grew out of it, but the series itself still has that stigma. Supergirl is the most childish feminist propaganda for the first two seasons, to the point that I enjoyed it ironically.^^ Gets better as well and even allowed itself one or two " more subtle" side-characters in Season 4. Flash is supposed to be joyful and I actually like that it's the one going in the darkest places without even you knowing. The protagonist having a Batman-like obsession with Reverse-Flash, responsibilities regarding criminal lives, rights, image, that full episode when everybody is one second from dying and he slowly realize he won't be able to save them, etc. Legends I watch fully for the corny factor. It's anything goes, Season 3 finale being the greatest taste if you went till then.
But, yeah... I watch Arrowverse like I watch amateur series. I see the wires, I see that they had 3 days to make 5 VFX that should've taken 3 weeks, I see that the writers are working with a basic plot and 3 locations to make an episode work. If you don't embrace the corn and if you don't survive through a few seasons of repetitiveness, you won't make it.