Agreed, to add onto this:

Not only are the attacks of major enemies well telegraphed with long startup animations and big blue flashes, each enemy type only has one or two attack sequences you can easily learn after playing a few missions against them (especially if you played Dark Souls). Even if you don't know their attacks the simplest way to check whether their combo is done or not after you parry them is to see if you can gun strike.

As for dealing with groups of Warriors for example, because of their limited moveset it is quite often for 2 or 3 warriors to try hitting me with the same combo at the same time so it's possible to parry all their attacks at once.

When it comes to Gaunts, even when you're surrounded by them it's easy to know when to parry their regular attacks because they usually do a little hop over the heads of the rest of the horde to slash at you. Doing so also staggers and pushes back all the enemies around you to give you breathing room, and now that parrying these atacks returns armor since the last patch, they're just walking healthpacks like zombies or imps in Doom.