I already like Marvel more than DC as is, so let the truth be proclaimed.
Seriously, outside of the MCU, how many truly successful cinematic universes have been made? The Monster-verse, maybe? Star Trek and Star Wars were doing the cinematic universe thing long before cinematic universe were a thing (and have far richer lore, at that), but they were kinda invented from the ground up rather than welding different stuff together the way cinematic universes now do it.
I don't think the DCEU was destined to fail (of all the cinematic universes studios have tried to pull of, DC was one of the only logical ideas and something that actually deserved one), but it does seem the combo of their impatience to catch up to the MCU right away without actually putting in the work needed to make it happen and whatever happened with Zack Snyder and how they made him the captain of the series as a whole really hamstrung them going forward. It kinda seems like they don't know what they're doing now and the good stuff had been single creators with a vision for a smaller set of stories having the freedom to do their own thing.