Honestly, I find Boba Fett to be a good pilot. As good as Kath. Her ability is better IF it happens, but thats a big if. I have been playing Xwing since last May, and I used the Fettigator almost exclusively for a few months and I found that the ability to change direction and speed of banks is very good. While I can usually predict where my opponent is going to move, I am able to admit that I am not 100% accurate, Im maybe right 60-70% of the time. People surprise you. Kturns out of no where. Boosting an maneuvering where you didnt think theyd go. Fettigator fixes that.
As for asteroids being in the way, you do realize that you are responsible for placing 1/2 of the asteroids in the game? Place 1 on a corner and the other 2 in an equilateral triangle from it. That opens the table up a lot. Especially if your opponent placed the first asteroid on your side. Imho its always best to place asteroids where they are best for you, rather than a nuisance for your opponent.
As for Boba Fett not being used in tournaments? Well one explanation is that the internet, and gaming forums, are festering pools of group think. Net lists exacerbate this. Everyone tries to use the list that one the last tournament. And then there are the vocal community members with a bit of online clout that blast a ship, and suddenly its reviled publicly. And then not used because the internet said it sucked. Finally the fact that it was not used in tournaments, due in part to the internet saying it sucked, is then used as a reinforcing argument that it sucks.
You know why Boba Fett isnt used in tournaments? Because the current meta values quantity over quality. Why pay 39 points for PS and a situational ability when I can pay 33 points for the same ship a be half an academy tie ahead? When the meta rebalances to valuing higher PS pilots, then Boba will be a better bet. As you say there are too many ships blocking him now, well when people start flying PS4 swarms vs PS1 ones, thats a ship or two less on the table. And then there will be those that fly the PS6+ squads to out shoot the PS4 squads, and they will have even less ships. Which means less stuff to block Fett with. The Meta is constantly changing and wave four is a portent of things to come.