Just because most requests are granted doesn't mean that the court is a rubber stamp. It's just the opposite.
Most criminal indictments are also end in the state's favor, but that doesn't mean the jury system is rigged, it means that prosecutors don't bring cases that they are likely to lose. Similarly, the FBI doesn't apply for a FISA warrant unless they are certain its well warranted and the court's decision will be easy.
Regardless of how strong the government's case is, we have a right to face our accuser. The existence of the FISA court, and all its decisions, are, if not illegal, morally bankrupt. I don't care how strong the government's case against me is, I want and am entitled to my day in court. No quantity of legal talmudicry by government lawyers can change this fact, and therefore can't change any right-thinking person's mind that FISA, or anything like it, has no place in a democratic society.
A warrant is a warrant. An expression of the governments investigative powers.
The police aren't required to inform you and give you a chance to argue your case in court for why thy shouldn't raid your house for the drugs they're pretty sure you have.
Cops don't need your written permission to point speed radar at your car.
With a "real" warrant, I will eventually find out that it's been issued, either because I'll be served with it, or because the evidence will show up in court and the prosecutor will have to explain how they got it. It's totally possible that literally all people on Earth are currently being surveilled under a single FISA warrant, with any prosecutions in real courts being disguised by "parallel construction". We don't, can't, and probably won't ever know if this is the case.
You mean the secret court, with secret rulings, where only the government's case is heard, and 99.9% of requests are granted?