Titanfall2's horde mode is live which they call Frontier Defense where you guard against a fortification for five waves against increasingly tough enemies mostly comprising of lots of titans. You start off on foot for the first wave but after that you stay predominantly in a titan with none of the parkour running first person shooting the PvP mode heavily features. It's fairly basic as you mostly fight a variety of titans with some basic options to buy some upgrades and fortifications between rounds but it's a reasonable challenge even on easy and it gets very hectic near the end of the later waves when the titans are assaulting in big numbers. I haven't tried a higher difficulty level as the titans get more capable as they are levelled up so mine aren't good enough for it, there's a lot of upgrading which gets a bit dizzying...your character gets upgrades, each of his weapons get upgrades, the titans get upgrades and probably other stuff that keeps flashing up on screen that I'm not sure what it's doing.
It's meant to be coming to EA Access tomorrow which if that's the case will be an easy buy, the mode gets a bit repetitive but it's cheap enough to give it a go and the variety in the different titans you can choose mixes it up a bit.
Used correctly terrain is a second weapon in your arsenal, equal to your Titan itself. Make the battlefield work for you, or you will find it working for your opponent.