I was also pretty disappointed as I thought that this game is going to be interesting, but seems like Lecister gave up as the 1st place at the house is already guarenteed to them.
Anyway 5 goals doesn't put the justice in the game as they were playing with bench players
It is very common to happen when a team already qualified to the next round and the upcoming match wont make any difference to their position, they will play with their second line with difference strategy. As a gambler, I put this condition into my consideration and I wont make bet at such games!