Joelaudadio, you basically raised two points: 1. Is Roku3/MLB.tv choppy video solved? And 2. Is Roku video inferior to other streaming devices like FireStick?
1. I saw several games yesterday (4/21/18), and some played reasonably smooth, but others still had that irritating choppiness. I use a "quick fix" to circumvent it (i.e. press "pause" button then press "play" button, then repeat that sequence) and it smooths out for a while. But, at least for me and my Roku3, the problem is NOT fixed yet. In contrast, when I watch MLB.tv on my Amazon FireTV, the video is flawless. No choppiness whatsoever, and frankly, the video quality is much sharper and more crisp. But I too prefer the Roku3's interface over the FireTV interface.
2. Video quality... As alluded to above, I find the video quality of the FireTV to be far superior to the Roku3. It's not even close. This is not just with MLB.tv, but with other streaming content too, such as HBO, ESPN, Fox Sports, etc. Admittedly, my FireTV is relatively new whereas my Roku3 is relatively old, so the FireTV probably has a newer and more powerful graphics processor. If I could get the Roku3 interface on the FireTV, I would use the FireTV exclusively. However, another thing I've noticed is that the screen-mirroring capabilities of the Roku3 are better than the FireTV, so if I'm casting from my laptop or phone to the TV, I prefer to do that with the Roku3 rather than the FireTV. That's my 2 cents.
Please - Roku and MLB.tv - please get together and fix this irritating video choppiness issue. Your users have clearly stated there IS a problem, they have clearly defined it, and they have provided excellent feedback to help narrow the issue. Please fix it and please do so promptly. Thanks!