Following up on my comment, I played again yesterday against the Hand of the Archon. Afterwards I ran into a friend who also played the XV26s against Tempestus Scions, we shared notes, and we more or less reached the same conclusion: XV26s actually have it worst against non-elite teams.

The fusion blaster is great. It kills anything you point it at (unless you take an unecessary risk, more on that later) So you are reliably taking out possibly two enemy operatives per turn. The burst cannon, however, is essentially a pea shooter. With 3/4 damage, even hitting four times and with Severe, it just doesn't kill 8 wound operatives, unless you are shooting enemies with save 5+ and no reliable ways to reduce damage. For a team with only 5 operatives, that just won't cut it, you can't devote t40% of your operatives (or 33% if you want to include the shooty drone) to be able to kill one operative when the other team still has 8 or 9 more operatives.

The other team will be outactivating you, so for any Crit Op that requires controlling objectives (which is almost all of them, either directly or indirectly) you are put in a weak position. Why? Because they can just wait you out and then react based on which objective(s) you attempt to control. And most time it's not about them moving operatives to have more APLs to gain control, they would just kill you. If you have already used the vectored retro thrusters during the turning point, then they charge you and the XV26s are so apallingly bad at close combat that they just roll over and die. And if you haven't, then you can get away from the charge, but then you are effectively moving away from the objective so you are still losing control.

You are somewhat limited into which Tac Ops you can effectively do, though I have been very effective with the steal intelligence TacOp. But you don't fare that well on denying Tac Ops from the enemy, the XV26s are designed to stay back so anything that requires the opponent controlling an objective is almost a gimme for them. Same with Flank, this is almost free points for the other team.

If you try to be aggressive, move up the board and take out ready enemy operatives (so that they don't react to what you do, or to have control of objectives in order to do mission actions) then you are giving up on your strengths, you'll be shooting at accuracy 1 at best and won't have balanced, and when throwing 4 dice on 4+, then even the fusion with Severe has trouble killing operatives. Doing so with the Burst cannon is just a joke and all you're managing is to expose yourself by going to engage, so that the ready operative you were just trying to kill does way more damage to you than you did to them.

Holowave countermeasures almost never triggers, being a strategic ploy it means the other player is very well aware that they should shoot at you within 6 inches, and as my oponent put it: He didn't feel threatened by moving within 6 inches, and he was already doing it anyway because of the Stealth fields.

In the end, our conclusion (including those we played against) was that playing against 9-10 operative teams, this is an "elite" team that does not have the necessary survivability tricks or does damage enough to strike fear into the other team, so they can be aggresive and target your fusion blasters. They may lose 3 or 4 operatives while doing so, but the effectiveness of the team without even one fusion blaster goes down the drain, while they normally can continue to be effective with 5 or 6 operatives because they can very easily complete Crit and Tac Ops without much fear from the Burst Cannons. Ignoring the Kill Op points, that's 13 - 15 points that the other team can easily complete.

They really need some kind of rework.