I'm going to give my honest opinion now to pagos after getting 35.
I enjoyed it to a degree. Now there are some things I wished they changed.
Music, for example, is one of them. Giving us the same Eureka type music just made the experience a down watering curve. So the fact that I didn't like the train, brought back the undesirable feeling to play with the music.
I wish they gave us daily quests, things that would help progress besides the once a week dailies. That way people wouldn't get totally burnt out. Challenge log was great but it wasn't enough that people felt any change at lower levels. They needed something to get them out of the disparity of grinding.
Now for some insight, I love grinding and I loved the harsh world they set out. I liked the dangerous feel it made me feel like 1.0 again. So this thing made me very happy. It brought back some memories of dying and exploring and it was great. I'm glad they did it no matter how many people hate the death walk. I liked it. Loved the elementals that cast with healing aggro and I love the agro HP mobs. I liked the dragons that aggro to sound but even when I was walking they would aggro me so idkwtf but its a cool concept none the less.
What I didn't like about the grinding that in 11 you could still grind and chat. In 14 your powering through rotations in silence just trying to hit a chain. You have to be on top of your shit to get to 30. I feel that is something they majorly need to change. At least so you can enjoy to grind and joke. More time for chains so it's not a total disparity or lower HP on monsters a bit more - take your pick. (People were complaining about Carpal Tunnel for goodness sakes!) In 11 you had magic bursts etc so chaining would be easier - this isn't the case here so SE needs to elevate it so it is not so mind numbing of a button-bashing silence through each run. This really would have changed the feel a lot.
Also please change the music again.
NMs should have a higher spawn rate. Not like overtly so but I've been in an instance fresh through the whole nine yards and no NM spawn makes you feel kind of - slap in the face. Especially so when all that grinding with no pause and chatter. It's just not good. It really isn't. So it needs to be changed if it already hasn't.
I do again like Pagos as terms of dangerous and less train - but I still feel like they shouldn't have made mounts so hard to gain.
I have been however at 35 - with my lowbie friend at 30. He does gain 2k exp on crabs with me and another 35 power leveling him. You might say that's not much but considering how fast we killed and how much chain 30 we gained it was not a steep slope. Much better in the end so there is not loss hope for those trapped on lower stuff. Find your 35 friend - and ask them to help you until SE sorts the mess out.