With the limited choices, I thought I should explain my vote of Great, Go Buy It!
I don't like micro managed RTS games. I also don't like it when I have to somehow be perfect in managing RTS games or I have lost. The computer never messes up, I rarely play against someone, and I need to be near perfect myself or all is lost.
RoN isn't that type of game. There is some micro management with the armies but most other units can operate on "auto pilot" and figure out what to do next. (There is an alert to say when workers are idle.) The levels are tough but not impossible to do and mistakes can be made without having to sacrifice the game and start over.
RoN is also a quick game and I think it is *intended* to play that way. I can play a game in about an hour and go from stone age to max tech levels in that game. I personally like that style of play.
Something else I never understand was differences in units. While I understand it, I never see the units make that much of a difference. For example, infantry type A being good against vehicle type C. Infantry can be run over, so the vehicle is still slightly better but they might kill one or two. In any type of RTS game, I never saw the realized advantage of this because of game play.
I am a big fan of grouping and I do that. However, having no control over specifics, my big complain for any RTS is that I wish it would automatically have units do what they are good at without me. When I have to set things up at that level, I never am efficient at it. That's me.
Having said all of that, I love the ability to make four huge type groups and send them into the enemy. At this level of strategy, flanking and grouping matters and some tactics will work. (Again, I am not good at that level of strategy, so it is probably me.) And it is a lot of FUN! (I have the same fun doing the same thing in Star Trek Armada series of games.)
I haven't played the expansions. I did see a difference in what people you played because of the production and resource benefits. (Again, I don't see unit differences but that is me.)
I certainly enjoyed this game. I would say it does a good job of combining the elements of the orginal Civilization game, which I enjoyed a lot, with a good RTS as well.
I hope this helps! Have a good one! Take care!
edg