I do feel that they fixed the Beluga when they removed the silly passenger slot restrictions. I also feel that the Type-9 is in a good place. Personally, I don't feel that the large ship situation is where the problem lies today. The Corvette, Cutter, Anaconda, Beluga, Type-9 are all excellent ships that have a purpose in the game. The Type-10 is probably the one that needs some love to make it more viable. There was a huge thread about that recently which had some good ideas.
I fully agree on this part. The only two large pad ships which really are a but underwhelming for that size are the T10 and the Imperial Clipper. The first one needs some help, the second basically is acceptable when you consider the price and rather view it as a medium ship which can't dock at outposts.
Of course i'd prefer if any ship was viable, with no "cheap stepping stone" on the way. But i guess that's a different topic.
Where the game is really broken ship-wise is medium class. The Python and the Krait Mk II tower over every other medium ship in the game and make almost any other choice pointless except maybe for RP reasons. I can't even think of these ships fondly anymore because I think they are just way too overpowered in almost every role. Even the Anaconda is in many ways less versatile than these ships because, much to my everlasting sadness, the whole game revolves around making these two ships the focal point.
Interesting point of view, considering that many PvP players still consider the FDL the best choice and the Mamba also seem to see plenty of use. The Federal Assault ship seems to have fallen a bit behind by now, but as long as FD considers price a balancing point and cheaper ships are supposed to fare worse (with no chance to redeem themselves), this is just what has to be expected. In contrast the Federal Gunship still seems to have people liking it, mostly in a PvE environment. It may be niché, but that's exactly how it was designed, but it seems to do the job there. Looking outside of combat, plenty of explorers seem to still use the Asp Exlorer or the Krait Phantom.
So all in all: yes, there are a few medium ships which fall behind the rest. Usually they also come at a lower price tag, which seems to be a good reason for FD to keep them as mere stepping stones, instead of offering an option to bring them on par to other alternatives.
What's really falling behind, and even so far that people seem to already have forgotten about them, are small ships.
They don't have the internals to be of interest for most activities. For exploration there are alternatives with more internals, more jump range and still good maneuverability in the medium segment. For anything related with cargo, any medium or large beats them by far. In combat their small size and higher agility could be an advantage. But considering how far you can stack up defenses and that higher ranking NPCs even do that by now, they are not capable combat crafts any more. It rather feels like scratching an enemy to death. While there are medium ships which, thanks to engineering, also by now are rather agile, much more surviveable and bring much more firepower.
So the small ships are actually the lost and forgotten kind of ships, which really could use some help.