So, what is this game like? The OP made sense in a way and recent posts sound like its a good time to try it, but the OP didn't entirely sell me on it; it reminded me (sorta) of the kind of browser-based thing like Battle Dawn, where you can research and have resources and fighters etc, but get stomped and give tribute to some nearby high-level guy right after you're attackable.
It is, in mechanics, a more complex version of your typical browser-based strategy game. The community however is unlike any other such games that I ever tried (that is, dozens of them). While in most similar game feeding on the weaker players is the most efficient and sometimes even the only way to progress, this isn't really the case in Illyriad. Attacking weaker players is generally not very profitable, frowned upon by the community and can lead to the attackers becoming the next play toy for established players looking for an excuse to flex their muscles (and use their catapults).
Illyriad is one of the most peaceful game in the genre. A few reasons explain that. First, building a sizable city and army takes a lot of time (easily months for the former and weeks for the latter). Second, basic resources and even, to some extend, more advanced resources are easy enough to produce in large quantities, sufficient to fill your own needs, so there is generally little incentive to go after what others are producing. Time is the most important "resources" in the game, since you can only build/produce/research so much at a time. Resources production can usually more or less keep up with building/training/research. Third, even attacking another player can be a huge task. The combat mechanics generally favor the defending player(s), sieging is not an instant win/lose situation like in most games, it takes hours/days to finish, giving time to defenders to organize and counter the sieging attempt. So, generally, you won't be attacked by anyone unless you are in an alliance involved in a war.
I'm not very good at giving detailed descriptions and explainations, unless I spend the day doing so... which I won't do
But that covers some of the main difference with the typical browser-based games out there. I hope someone else can elaborate a bit more. Also feel free to ask any question you might have.