It is noticeable as [Rec]4 starts that Jaume Balaguero has abandoned the Found Footage approach that all the other [Rec] films took. This may well be because the Found Footage approach has become so overused by other films in the last few years; it may be that he found he could not tell the story he wanted via handheld videocameras. (It should be noted that [Rec]3 also abandoned the Found Footage approach part way through). This follows closely on in continuity from the other films, with the senile Ma Alfonso Rosso being one of the guests from the wedding so as to wind in connection to [Rec]3. This film also brings back Manuela Velasco, the news-presenter heroine from the first film, who is now looking quite a bit older despite the fact that in terms of the series internal continuity this is only supposed to be taking place a day or so after the event in the apartment building. Later in the show, Balaguero strips her down to a singlet to go into action, although Velasco is a much quieter personality and is unable to carry the strong kickass heroine role the way Leticia Dolera did with chainsaw in [Rec]3.
The disappointment about [Rec]4 is that without the Found Footage approach, it now becomes just another zombie film. (This also downplays the demonic possession angle with the revelation that the infection is caused by a parasite rather than supernatural forces, which seems to contradict [Rec]3 where we saw the zombies being halted by the recitation of Bible verses). The film falls into predictable areas in the plotting department with obvious dramatic tensions like the coming storm and the power cuts, which you just know are going to kick in at crucial moments as the zombies are attacking. The film certainly features some extremely detailed and gorily convincing zombie makeups. On a story level though, this is nothing too much beyond the idea of an outbreak aboard a ship and you feel that there is little here that adds to the [Rec] series overall.
That said, despite a relatively unexceptional middle, Jaume Balaguero finally finds the films stride in the last third and delivers an entertainingly gory bloodbath with survivors taking on the infected, including wading in against them with an outboard motor at one point. The film builds to a more than reasonably effective climax during the scenes with the survivors being driven to the very prow of the ship by the zombies during the midst of a storm and then forced overboard.
Jaume Balaguero has also directed the occult film The Nameless (1999), the haunted house/occult film Darkness (2002), the ghost story Fragile (2005), Sleep Tight (2011) about a sinister apartment manager and Inside (2016), as well as the story for The Nun (2005) and producing Summer Camp (2015).