It's a case of 'Damned if they do, damned if they don't"!
If DC had done the 4 or 5 movies, they would have been accused of copying Marvel – so they try to be different and they're still lambasted!
Personally I like what DC have done... let's face it, the characters (for the most part) are so well known, they don't need esablishing like the individual Avengers do... Everyone knows Batman and Superman! I also like that they've set a different tone for their universe... it's more realistic (if a CB can be such) and shows the consequence of these characters and the powers they have, as opposed to the MCU's which seems A-Team-like at times. Plus, if the DCEU and the MCU were to mirror each other for tone etc. the average movie goer would start to lose interest in the genre, and most likely would confuse the two universes – my missus, for example, neither knows nor cares that Batman and Spiderman are not in the same universe. It's like any genre... The Shawshank Redemption is a great prison film, but so is Stir Crazy... we need diversity in the genre or it will die!