Is it perhaps because you haven’t found a variety of recipes to use it for? Having said that, just about anything you would put in your oven, you could use the fryer for (not things made in sauces, stews, batters, etc, though). I’ve not had mine very long, and I don’t use it every day, but I have found that it’s good for doing the salmon recipe I used to do in the oven (I bought a silicon tray to put it in) The salmon goes in the dish with some tomatoes and a dash of white wine and cooks beautifully in the fryer. I’ve also cooked chicken breast, a gammon steak and, of course, the ubiquitous oven chips. I haven’t yet cooked my own chipped potatoes in it, but intend to. It’s good for reheating scones that have defrosted from the freezer, and bread etc.
I think that for me, it’s getting used to the timings as I find foods take a little longer than the guide book with the device suggests, but generally, the timings are pretty similar to the main oven but the pre heating of it is much less.
So perhaps experimenting a little more with it might endear it to you but if you still don’t like it, sell it on (or if you bought it from Lakeland they have their 3 year return guarantee as long as you have proof of purchase so would be able to get your money back). I hope you find that you can get on better with it, though 😊. Good luck.