I loved it for what it was; A creature feature action flick I understand why some people might not like it.
The occasional comic relief (which imo wasn't anywhere near as bad as in many, many, many similar films), the time travel "plotholes" (can we ever avoid them if we really think about how time travel would work "realistically"?) and the ending where they instead "do it themselves" in a blaze of glory, than taking their time.
However, I managed to entirely suspend my disbelief and to me, this was great action entertainment through and through. Pretty much exactly what I hoped for too.
I especially found the creatures themselves to be incredibly cool.
I don't remember when I've last been so fascinated by creature design ever since the Aliens and Predators. (The creatures, separately, NOT the AvP movie)
How in the hallway, the creature ducks down low to press it's belly and neck to the ground on occasions, crawls on the wall so only it's back is facing the people shooting who rotate in the stairwell and in the end even is in the ceiling momentarily to protect being shot to it's vulnerable spots from below.
Or how one of them slams the tentacles on both sides of the hallway, to the door structures and shrieks as loud as it can, to ensure the vibration of it's shriek will reverberate through the whole building from the structures.
Or how another of them hops on a dumpster, shrieks and bangs the dumpster with it's tentacles to alert where the humans are.
Or how one of them signals two others to attack from different sides, with it's head movement. (Easy to miss when they're on the street after coming out of the hospital)
Sure, there are times when they're conveniently slower or more careless with protecting their squishy parts to enable fighting scenes to work, but I didn't find it to become too disruptive to the flick.
Many reviews criticise how Chris Pratt's character want's to go back to the future timeline after manufacturing enough of the toxin, to save his daughter v2, because the timeline wouldn't work then, if they already had the toxin in the past - but... who in the movie is claiming that it would've ever worked like that? He's being sentimental, not accepting that the adult Muri will die.
How do we even know this movie depicted the idea as "one and the same timeline"?
What if the timeline where the creatures escape and humanity loses will ALWAYS be like that.. that it has "already happened" on the future timeline (remember, the "rafts always keep moving in time"), it's events ever unchanged no matter what happens in the past of the other timeline?
Sure, they tried to ask help from one past timeline to help themselves, but at least ended up saving one alternate timeline from the same fate.
If the two timelines are considered separate and unchanging, the toxin would NOT disappear when Pratt brings it to the past and kills the aliens, because he'd never negate the future adult Muri's timeline. That they're two different instances of time.
Sure, whoever has only adopted the idea of timetravel that "Back to the future" depicted will have trouble with the plot, but I honestly didn't, as I never assumed it's like that.
Oh and when they found the alien spaceship and decided to get rid of them then and there, I also found it careless and "what if they'd set them free now?", but in the end, whose to say the government wouldn't try to save them and use them as weapons themselves, or study them and screw it up anyway? They had a way to ensure they're killed; The toxin.
Though sure, after some of them were killed, the rest woke up. But the toxin sure worked for the female creature. (I also loved the part where the creature bit off it's own arm... the kid in me whose a sucker for cool monsters and stuff was giddy as all hell at that point)
Anyway, I was really entertained and truely liked the flick. Would honestly hope to see more of "The white spikes". Sure, would welcome if it was more fleshed out, more serious and better written, I won't deny that. Even still - creatures were cool, action was satisfying. Great popcorn flick, at least when not in company of people who enjoy nitpicking every inconsistency during watching.
(If you didn't like it, I'm not saying you're wrong. Different tastes!)