Hi Furney, welcome to the forum
You will always find negative reviews of any zoom lens that costs less than £200 because most are generally poor when compared other lenses which are always (of course) more expensive. You should be able to pick up lenses in the next price bracket for less than £500 though.
For example, the
Canon 75-300 is £225, the
Canon 100-300mm is under £300 and the
Sigma 70-300mm OS is £300 on the nose.
If it was me, though, I'd have the
Tamron 70-300 VC which is around £350 and an excellent lens.
You should even be able to find the Canon 70-300mm IS for under £400.
Generally speaking, the Tamron you mentioned is the best new option for under £200. You could consider a used lens. You might even find a stabilised one.