The game does not allow rotation of the viewscreen, though, so units will get to places that you can't see them. AoE2 kindly outlines them in your colour to make them more visible, which is a nice touch, but it still would have been nice to have a rotatable engine a la Submarine Titans. Ah, well.
The various units and structures are fairly detailed -- the structures much more so than the units. There are a few different 'sets' of structures, and a unique unit or two per side, but for the most part, the various empires look very similar. For examples, the Britons and Celts use the same building style, as do the Japanese and the Chinese, or the Persians and the Byzantine. It's understandable, certainly, but it trivializes the differences between the cultures even more.
Thankfully, the sounds are different between the cultures. Each empire has its own language as the 'response' sounds, which is a nice touch. The sound effects, with the clangs of swords and other such goodness, is quite nice. As you pan your viewscreen around into a battle, you really feel like you're witnessing a struggle instead of a collection of pixels fighting it out. The music is solid as well, providing a good atmosphere for the game, both in and out of battle. The campaign voice acting can grate a little, as some of the accents feel a little silly, but it's certainly better than the 'bargain basement' stuff you usually get in games.