Oddly, i enjoyed it.
Yes, Tissen isn't Hamilton in any way. Yet, this ex-mma fighter (and ex-math teacher. Well, wow!) somehow proned me to compare his personage with great&awfull T. (Yeah, yeah, cyborg vs terminator. 2 big differences. Not the point.)
Yes, there is bit too many citations. Yet, it was fun trying to guess which move from which movie.
Even Greenwood's perfomance was acceptable.
So, yes, this isn't classic of all times. Yet, this is "company of good friends", "put aside your problems for a time" movie.