I think i've tried every p2p MMORPG that has come out since like 2006. But, -NONE- of them have come close to being as fun as the old ones.
You didn't need to worry about people botting, you were preoccupied with KSing. You couldn't buy gold. GMs were actual people that played in game that you could /tell
Anyone know if people are still playing these?
My first MMORPG, Last Kingdom, and by FAR the best i've ever played:

Helbreath. My second favorite RPG. I remember rerolling every other day trying to decide if I should get GS or go straight for Flamberge after the dummies.
I also remember you could hack the client and have it believe you paid for the account. It meant that the P2P game was F2P for anyone who could download a hex editor.
Another story about Helbreath: Someone told me they could hack the game and level your player to any level. I didn't believe him. He told me to relog, I did, I went up 40 levels.

Prince of Qin, I remember playing Beta. Was a pretty good game:

UO. First time I logged in, some maxed out person kind of ran me through everything and set me up. I was overwhelmed and had no idea what I was doing.

Tibia. I remember mining a lot

T4C!

Dragon Raja - I was a lightning mage

more... I forgot their names. I remember one you had to be in RP mode 24/7. If you came out of RP you had to type inside {} otherwise the GMs would throw you into jail or you could get banned. I remember you also could run for mayor or something like that and people in game would vote for you. Also religion.. There were different temples and to join a religion you would have to pass a 1 on 1 test with a priest class player who basically acts like the temple's cleric.
This company had two games. IIRC the second game was asian themed and it was tons of fun.