The issue is ‘I want to enjoy the game’ means somethings else for everyone. What i like, can be boring to you. What you like, can be boring to me.
I already told my experience with the ranking at Voobly and HD. I also started with playing just one map (BF) and i started to get better into that map, so my rating increase. After a while i got boring of playing the same map over and over again. So i wanna play other maps (like Arabia). This map is completely different to what i used to play. Players at my own rating would steam roll me, players of a lower rating wont play me. So you are kinda stuck with playing only one map.
So the ladder at Voobly / HD was only good for ‘one trick ponies’, players who just wanna play the same map over and over again. The ranking was pretty bad for players who wanna switch from one map to another map or for players who like map variaty and play at different maps everytime.
For me, as someone who likes playing different maps, the current matchmaking / elo rating is delightful. I like how i can easily play different maps against equally skilled opponents. I feel like the match ups at DE are much better than on HD or Voobly. Note: I mostly play 1v1s, there seems to be an issue with team game ranking, same as for the hidden unranked ranking. See:
I feel like if you have unlimited bans, it will be the same as voobly / HD again with drawbacks i described above. Some of you would love that, others dont really like it. At this moment i just dont see any good solution for everyone. It is ofcourse the dream to have just only AoE II DE and everyone enjoys the game, so we dont have any need for Voobly, HD or even Gameranger. If someone has the ultimate solution to this issue, i will immediately vote for that solution. It is ashame it is non existing at this moment.
I won’t mind if the number of bans will be increase by a bit. Unlimited isnt the right call, i think, but lets say 6 for 1v1 is pretty much possible. I really dont know about teamgames, since you need to match multiple players into one game and if you all have many bans, i dont really think it will work. Multiple bans in teamgames can also lead to some issues: You join the queue with 2 friends for a 3v3. If everyone has 3 bans, you can ban every map, so you end up with no valid maps. So you need to avoid such situation.
I also dont really know how easy it is to increase the number of bans. Maybe the match making algorithm needs to change. I guess it will pick 2-8 with around the same elo from the same part of the world. At the end it just randomly pick one of the non banned maps. If you increase the number of bans, there is a risk of having no valid maps. So matchmaking needs to consider also the banned maps of all players and check if there is a valid map. This means they have to change the algorithm and can result in much more waiting time.
You agreed with Hardwell it was MegaRandom. But yeah, doesnt really mattter 
Yeah, i have some some really interested maps in the past tournaments. I would love it if they add those to map pool at some point.