I have used it and people bash it because it's a poor product. It absorbs poorly, it's horrible to deal with (slow drying), it's expensive if your insurance won't cover it, and it covers to much surface area leading to high DHT and high E2.
A superior transdermal is a compounded T gel or cream. You can have them compounded at 5%-20% as opposed to the ridiculous 1% Androgel. The compounded products absorb much better, dry faster, and cover much less surface area leading to fewer E2 and DHT issues.
Beyond that it's now being widely accepted that T cyp can be injected in small amounts SC which is the most convenient TRT available. Personally I've used every TRT regimen available to see what worked well for me. I've been on Androgel, compounded T cream, compounded T gel, HCG mono-therapy, and Arimidex as a standalone treatment. I've found that for someone my age, 36, the best route is to administer the maximum dose of HCG that can be used before side effects or desensitization become an issue and top off the balance with a little compounded T gel if needed. For older guys, who don't produce much T with HCG, T cyp is by far the most convenient with a small amount of HCG to keep the testes functional.