I would say the community is the strongest reason I have stayed in Hattrick for so long. The game too of course. After having trained my players and played in the French Division 2 for a while, I started focusing on training international players to help the Moroccan team. Today 80% of the defense of the Atlas Lions was trained by me!
The best moment for me is when a youth player finally has finished the training you envisioned. I still remember the key players from my time in Hattrick. Josip Dumont-Damien was one of the first ones, Luc de Romrée de Vichenet and Mamadou Toure are players I remember fondly from my last generation.
My biggest achievement in Hattrick so far is that I have won some titles with my second team in Bahrain and reached the semifinals of the National Cup in Italy, but I hope, a few months from now, that it will be winning the World Cup for the Italian NT.
I like that Hattrick is a slow game. Here, I have time to think everything over. I also appreciate that Hattrick gives everybody the chance to be the best because you can't buy in-game advantages.
What I like about Hattrick is that you have to make plans for the long term. I also like the pace, that you are not playing matches every day.
What I like about the Hattrick community is that there are real people and you don't just compete against the computers. You play against each other, but you can also help each other in the forum and talk about everything.