From the ones I watched, Boxing it seemed like pure stamina or strategy. They do a lot of work in the first round, but by second half of the third round that energy just goes away, and the other guy starts to come out on top, and by the third it comes down to flailing away aimlessly.
Wrestling and badminton seemed liked nervousness. An interview with the wrestling coach said that some of the guys and girls who missed out were just nervous (gave the examples of Satyavarth and bajrang, who looked monstrous through the games, but lost meekly in the finals), and badminton there were so many unforced errors. Todays doubles match...5 game points lost, and going on to lose the game , PV sindhu losing out to a much more lower ranked player, similarly Guru Sai dutt , after being on match point, loses the entire game.
Maybe it's also a feeling of satisfactiona nd not trying hard enough after losing an advantage (I already have a silver....)
Anyway next up will be the Asian games at incheon, so hopefully they can analyze these mistakes and do okay there, though I think those games will be harder than these games.