I would love for DOA5LR to adopt a World Arena feature (Global Coliseum in SCV). When I moved away from SCV and began playing DOA5U, I was honestly surprised no such feature existed! For those of you who aren't familiar with SCV, here's a quick rundown...
Here's what the SCV Global Coliseum looks like. Apologies for the LQ video, but its all I could find. Just watch the first 12 seconds for a visual of this in motion:
If you want a brief description of the features, read further.
The illustrated rectangles you see is your own counter. You move around with the directional input and either challenge opponents, go to a ranked tournament battle (top large red rectangle), or a random battle by dragging a cursor on them and selecting it.
In SCV, the Global Coliseum allows for players to make smaller lobbies called "lounges". There's also a ranked tournament every month or so (?), so players who enter randomly fight others for the highest . There's a leaderboard which shows who has the most wins. It adds a competitive element to the online experience. Not only that, but in the Global Coliseum, you can opt to fight other players randomly with a random battle feature (bottom large gold rectangle). So if you don't want to confront anyone, you can go to that section and wait for someone to join in.
With both features you can see how many people have entered - so if say 20 people have joined a Ranking Battle tournament, you will know you can easily find a match. If just say 1 person entered, you'll see there's no point and you can just challenge other players yourself. Before accepting a battle, you can also see the connection of the opponent, so if you weren't fond of say a 2 bar opponent, you can decline their challenge.
The amount of options you have from this kind of World Arena added so much variety; finding a battle was so simple. Its unfortunate TN haven't attempted to adopt this seamless online experience in recent iterations of DOA. Hopefully TN reads this ^^!