I have directed my SO to Black Lagoon, the occasion for me to do a rewatch (I probably watched it in 2009 or 2011...?). Surprinsingly, the action scenes are a lot more pedestrian than I remembered (Especially the S1 Roberta's episodes, it's good fun but really derivative and there's a bit of filler). The writing, however, is holding really well : characters are memorable despite the first impression of a Cowboy Bebop ripoff and the somewhat crass design of Revy, and there's some actual depth to their interactions. The series is also very strong in the setting's depiction, and I suspect it took some cues from the John Sayles penned Men of War movie. Either way, it manages to create characters and places that are both abhorrent and sympathetic. There's a bit of self awareness going on too, and the show never goes full distinguished mentally-challenged fellow dark & gritty either.
Never watched the OVA mini series which serves as S3 ? Is it good ? I'm a bit worried that Roberta is in it... as I said, fun character but super gimmicky also.