1. Wonder Woman, by some distance. Loved it when I first saw it in the theatre, loved it even more on repeat viewings. I think what worked for me personally was the tone of the movie - serious but good-humoured - and the fact that it really managed to get me to care for the characters. Sure, the final act wasn't as good as the rest of the film, but by then I was so invested in the characters that it didn't really bother me. I also liked the balance of action and drama in the film. It doesn't quite have the best action scenes of the DCEU - that distinction goes to Aquaman - but I thought every action moment felt earned, and Gadot delivered big time too. Got me seriously hyped for WW84.
2. SHAZAM!. Without the benefit of multiple viewings, would say this is easily my 2nd favourite of the DCEU movies. I think its story is more moving than WW's, but where SHAZAM! lacks is in the action department. Also I thought it took a little long to get going - I was somewhat bored until Levi showed up, but then I was hooked until the final, overlong and slightly underwhelming battle. Hopefully the sequel comes soon as the kids are adorable.
3. Aquaman, almost by default. A gorgeous spectacle of a movie that I really enjoyed when I first watched it in the theatre. However, I found myself getting bored on 2nd and 3rd viewings. I think Aquaman's problem for me was that it felt empty underneath the spectacle and action. Momoa is very charismatic as the eponymous superhero, but somehow I never really cared for him or any of the other characters that much. The romance between Aquaman and Mera also felt forced and unnatural; I don't think Momoa and Heard have great chemistry. That said, it has pretty great fight scenes.
4. Justice League. A mess of a movie, but an entertaining one. Enjoyed pretty much every JL member other than Batman, who was seriously mishandled in my opinion (no way would Batman's jaw drop in delight when he sees Superman!). Henry Cavill was great in his limited screen time. Have some issues with the relative power levels of the various JL members though, although I appreciate the aversion of "Batgod".
5. Batman V Superman (theatrical cut). Didn't like it. Joyless till WW entered the picture, and by then the film had already been ruined for me. However, it gave us an instant classic Batman fight scene reminiscent of the Arkham games, for which I will always be thankful that BvS exists. Might one day attempt to watch the Ultimate Edition given the online clamour about it being a misunderstood masterpiece.
The rest:
Man of Steel is a hard one. I've never managed to watch the film in its entirety as I found it boring, but based on what I've read about it, I suspect there's an intelligent, reasonably well-crafted movie in there. Might try watching it again one of these days.
Didn't watch Suicide Squad, and have no plans to for now as I have little interest in the characters.