You'll probably have some others point it out too, but the Romans are not a faction... they're actually 4 factions, allied (for a while). I'll bet that you'll get some debate that Egypt is a stronger civ. And in my own opinion, I find the Greeks and Selucids to be overpowered. Really, the Human is the deciding factor.
Also, people play the game in different ways, with the goal of having fun in their own way. It is good to see you are so quick at subjugating Egypt in only 25 years! Personally, I like a fast paced game, too (my own Seles had hit the showers and retired with 50 provinces + Rome a decade before your Egyptians bit the dust ).Maybe you can talk about your own Sele strategies. In mine, I used Diplomacy to the max, and the Scythed Chariot was just a monster, routing almost all before it. I felt the Selucids began with too much territory, and that enabled very rapid penetration into the Iberian Pennisula. The Egyptians were pretty much delt a death blow by the Nile when 1,000 of my guys went against 2,000 of theirs. I used the dogpile on their chariots, which were the only real threat in the few battles. The Scythed Chariots and cavalry turned the tide after crossing the bridge, and then destroyed almost all enemy before they could exit the battlefield. Egyptian remnants died as a race soon thereafter. Once, however, I tried chariots in the streets of a city assault, and wound up with amok chariots, LOL.
So I personally consider the Selucids one of the easiest three civs; they are balanced, have good finances, expansive territory, wonders, neighbors ripe for the picking...