I don't think this is true. Here's a list of all the gadgets that are good:
- High Explosive Launcher
- Assault Ladder
- Spawn Beacon
Assault probably has the least amount of good gadgets, but the HE Launcher is really good (unfortunately for everyone) and the Spawn Beacon is absolutely in contention for the best gadget in the game. The Ladder is great, most people are just bad with it.
- LAW
- RPG
- Javelin
- Aim-guided Launcher
- IGLA
- Supply Crate
The mines are in kind of a bad spot, but I find that using the Acoustic Sensor mine aggressively is very fun.
- Defib
- Grenade Intercept
- Missile Intercept
- Mortar (unfortunately)
- Smoke launcher
- Airburst Launcher
- Deployable Cover
- Supply Pouch
That is every support gadget, btw. The weakest is probably the airburst launcher, but it is still good and also incredibly obnoxious.
- Laser Designator
- Recon Drone
- Tracer Dart
- Claymore
- Decoy
- C-4
- Jammer
They need to buff the suppression again, imo, but that's almost every Recon gadget.
I think if you genuinely believe all the gadgets are bad, you probably are just kinda bad.