Size isn't what makes it less smooth, it's the refresh rate. People here think size and resolution are what makes a badass TV, however, their 120" TV with 1080p and 60 hz will be complete shit compared to a 65" 1080p with 240 hz. Resolution only matters for the detail, however, if it lights forming the resolution cannot keep up with what is happening on screen, such as with games that have a ton of motion, then it causes blurred effects and everything seems to be choppy or not smooth.

i dont believe 3d tvs are very good for gaming. they can cause a lot of input lag, mine did anyway.

My LED is 3D and it's great for gaming. Sole reason though is because I have 240 hz, highest refresh rates on LED TV possible, or at least when I bought it, making it a better TV for gaming and sports rather than just casual watching. However, I have played on 3D TVs before with lower refresh rates and yea, they were complete garbage. Either way, it still boils down to refresh rates.