Slightly too long, but pretty much every other element of 'Monkey Man' is more than enough to compensate.
I had a very good time watching what is Dev Patel's directorial debut. He himself is outstanding, having portrayed the role of the titular character perfectly. I had only seen the guy in two films ('Slumdog Millionaire' & 'The Last Airbender') prior to this, so very much happy to see him act further. An excellent job from him on and off screen, I'm happy that he managed to get this made in the end.
As noted, I do think the run time could've been trimmed a little. It's not a major issue of mine, at all, but at a few moments I did feel my interest wane a bit. The story itself is a good one though, one that is entwined with a lot of fight (literally) but a lot of feeling too. Visually, it's a beauty. As for those behind Patel, Pitobash and Vipin Sharma are positives; Ashwini Kalsekar does well too.
Most definitely worth a watch, especially on the big screen! I enjoyed myself, all in all.