T9 is a solid ship that really gives you a feel of being massive and slow. I strongly suspect people are comparing it to the Cutter, a MUCH more expensive ship with a huge rank grind. That being said, once you have the Cutter, there's not much reason to fly the Type 9 for heavy cargo runs since the capacity is comparable and the Cutter has a much bigger jump range and much faster thrusters.
There's also the Type 10 which I've turned into my dedicated miner. Although I'm still waiting on upcoming changes as I might need something more agile for deep core mining.
Well, aside from the Type 9's somewhat lower rebuy and generally more sedate speed relative to its handling. See a lot of folks not really respecting how fast and heavy the Cutter is and trying to boost directly at/into the station or just repeatedly boffo'ing their approaches in general. Not so much the Type 9.