I've been expecting a drop-off from this series and it has finally come. Admittedly, it still isn't all that bad.
'Hotel Transylvania: Transformania' is basically what I expected its past entries to be like, at least the most recent two. I mentioned in my 'Hotel Transylvania 3: Summer Vacation' review that the watchable plots were the only thing I was enjoying about these flicks (cast/characters being extremely meh, same again here) so one was bound to slip up eventually.
This one I found to be quite boring, if not terrible. Focusing heavily on just Dracula and Johnny was a bad call, especially given Adam Sandler's absence as the former. I actually wouldn't have predicted that the film would've missed Sandler (given my aforementioned thoughts), but it's a case of you don't know what you've got until you lose it because Brian Hull is a lame replacement; nothing against him personally, of course!
The setting of South America just takes out any 'Hotel Transylvania'-y vibes too, so another wrong decision in my opinion. Here, the story isn't interesting enough to, like across 1 to 3, cover for the gaps in location, cast, characters etc. - at least in my eyes.
Still harmless and all that, just lacking oomph.