I was also a big fan of Syphon Filter 1 & 2 on the PSOne. Got 1 & 3 on PSN and played then recently. They haven't aged all that well. The graphics being 3D and from that time are a bit of a blocky mess and Gabe controls like a tank.
I used to love the syphon filter games anyone know how they hold up to todays standard also me and my cousin used to spend hours just destroying each others vehicles in dustruction derby I know it is prob rubbish now but I am very tempted to pick that up too (not that I need to considering I have enough ps1/vita games to last me through the apocalypse