why does T-Mobile suck

i have been trying to stick to tmobile because ive never switched service before but im reaching a breaking point. i started with nextel, they were bought out by sprint. sprint and nextel both worked great for me, full coverage at both home and work. since tmobile has taken over, service at work is non existent. i call customer service and all they say is if it worked for srpint it works for tmobile because our coverage is the same or better. really???? is that why hundreds of people i work with at a major auto plant have switched to verizon? because your the same or better then a perfectly fine sprint service…. very upsetting. im aboubt to take my 3 lines elsewhere too. ive tried waiting.