I suggest you go back and rewatch the episode and focus on the part where Data is chewing out the changelings and villains on the ship.
1) The dialogue is hilarious
2) it's very much an evolved version of Data with Lore's Flair for the dramatic.
3) THE NEXT DAMN SCENE is Data explaining how he's no longer just Data bit an amalgam of all three and why he no longer has any interest in death.
We know they sent out 100 into the wider galaxy and only 3 would return by the opening of the Dominion War. Presumably Section 31 captured about ten of them to begin the experiments.
Not all the changelings presumably accepted the humilitation of the War Ending, as at the end of the day it was a humiliation for The Dominion in their own eyes and would break away. It's obvious that Vadic, and whoever's fully in charge of these Changelings is another agent within all of this.
Everyone got a bit obsessed with the ten shown on screen in the S31 experiments and forget a few episodes earlier where it's shown the infiltration runs to the hundreds at every level you can think of.
Interesting thing to note. We've only seen Evolved/Conspiracy Changelings adopt bipedal forms, we've not seen them be bulkheads, space squids, or anything not a human shape. Suggesting their mophogenic matrix has been effectively fixed into such a way as a compromise at beating all the scans necessary to truly blend in.
Quite the horrific thing to have done.
This was covered in like... Episode Two. Go back and watch it, they say it doesn't match any known Fed Database, and when they scan it a few minutes later it has a smorgasboard of weaponry from the Greatest Hits of Star Trek, including some the Klingons and Federation banned between them because of how horrible they are.
Weapons don't matter.
It's about shields.
Who can take more shots.
Any one of those super weapons could rip through the Titans shields in one shot, unless they Riker or Shaw got clever.
How many shots would it have taken the Titan to break the Shrike's shields?
10?
20?
The Titan can fire 20 full strength phaser volleys in half a second.
Whoever was writing this season has never seen Star Trek before.