Empire had different riflemen because the community was used to and wanted many units in a TW game. It would have been disastrous if they didn't do it thus from a commercial perspective. Even units sold online as extras was popular. It was also a game mechanic way to give character to different nations' armies.
The original RTW wasn't all that better than what you describe from the perspective you see it, but people loved it and it broke CA to the mainstream. I bet RTW2 will be just as succesful if not more; there is a huge fanbase for the Roman era that are period/historical accuracy fans, and with a new engine/graphics, lots of potential for modding and previous know how of the period by CA, RTW2, when made, will be a super hit. Practically all the post RTW TW fanbase is expecting it since it was made.
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