Since Reboot, Grapple got "nerfed", bigger CD, no protection even if you fail grapple, range nerfed.
Those changes were needed and they were totally understable.
But the "nerf" is really weird too.
After two months I noticed few things :

1 - I'm missing most of my grab when I'm in the front of my enemy. I fail like 90% of time.

2 - Most of my successful grabs are when the target is far and when there is desync. Even if the target is far, I still can grab it.
3 - Grab doesn't work sometime. It happens that I got the animation of a successful grab, I get the SA but in the end, the game is telling me "target in avo mode" even if this one isn't in IFrame.

4 - Getting CCed even if I have the SA during grab.

So, it's very weird like, it's totally random now. Maybe you'll grab, maybe you won't. Maybe you'll get the animation of the grab and the SA, but the SA won't work and the grab too, so you have to wait 15 secondes.

I think it needs more adjustments. Not like I want the old grab, no but it's just not finished like of the reboot.

Also another point, with the current meta, there is no point of having a grab but in the same time you need.
Some class deals so much DMG, they don't need to grab or CC to kill another class.
Again, some class is so protected now, like DK, Musa, Sorceress, Mystic, Striker, Lahn, Archer, Kunoichi, Ninja... The problem is, if you don't have a grab, you can't CC them. If you don't have enough DMG, they'll kill you in your protection because they can.
When I'm fighting a sorceress for exemple, even my biggest protected AoE with a Bound on it, doesn't CC ever. She's dancing inside the AoE.

So sometime, I don't get why I have a block and a grab when some class just double dash in my back to two shots me. But sometime, I would like a working grab to CC a target spamming a full protected combo / mobility beacuse my other CCs aren't working and because I have only one protected CC.

I'm very sad to see that PA doesn't balance the number of protections.
Some class has many protected CC, many protected DMG, many protected mobility.
Players complained about block classes but in the end, block classes aren't the problem. And grapple too.

The problem is simple, the nerf of 2018 is gone on those classes, they are so protected now, only a grab can CC them.
Bound, Knockdown, Knockback, Floating, Stiff, Stun don't work on them.
That's why they cried about it. Because they didn't like to be catch while spamming SA / Iframe all the time. For them, it wasn't normal.

It's really sad to see, because now players are playing DK, Musa, Sorceress, Mystic, Striker, Lahn, Archer, Kunoichi, Ninja only because they know they can be protected most of the time with protected CC, many protected DMG, many protected mobility.

From what you descriped, the issue is probably with your network, as it seems you have higher latency.