daylight robbery to who?
a ps3 and 5 games is worth much more than £120 
does the xbox one even have 5 games worth playing?
A Playstation 3 last year just before Blockbusters went under was worth £30 trade in value,and that was last October.
Most new games for about a month or a little more after are worth £25 max,but a game that's around 3 months old can be worth as little as £12.
I've not read the Game offer as I try to avoid them like the plague,if there are no hidden secrets about what games you can trade in then I guess based on the price slump of Playstation 3 it's not a bad deal providing that deal lets you trade in any game regardless of age.
But knowing game like I do it will probably games that are fairly recent,after imagine trading in 5 games from around 3 to 4 years old worth about £2 each and your Playstation 3 and getting that deal.
That would be beneficial to the person trading....but I'm sure deep within this offer there are catches,and lots if them.
Blockbusters served my needs fine and was a good stop gap to trading in unwanted stuff ,now Game have a high street monopoly once again and it's not a good position for lovers of games.
We need high street competition and Game haven't got any,they already killed of the independents and then bought Game station and ruined that.
And the people who work in them know absolutely nothing about games.