United Offensive has all the standard features of Call of Duty, but it threw in a few neat tricks. Flamethrowers were added to the game and light mounted machine guns were made available for the player to carry and reposition. You could also “cook” your grenade to have it explode in mid-air, preferably over an enemy. A number of these features have been incorporated into the sequels.
If you aren't familiar with the normal Call of Duty gameplay, then understand that it's basically a war simulator. I use the strange term because it isn't just a first-person shooter. You usually move along the battlefield alongside a number of fellow soldiers. It builds itself on the idea of being a small part of a large mission, and that's pretty cool.
The missions themselves are stretched across three main characters. You will spend time with airborne units during the Battle of the Bulge. There is even a mission to capture the town of Foy, so you can relive that one episode of Band of Brothers. Another mission has you playing a downed British airman who joins a special forces group on a mission to blow up coastal guns. There is also a campaign detailing a Russian soldier fighting in the Battle of Kursk during the intense trench warfare.
The Russian and American missions play out well with a mixture of tense fighting and tactical gameplay. As usual, the American experience is a balanced set, whereas the Russian campaign focuses on large scale tank battles with a number of drafted soldiers barely holding their ground. The weak link is still the British campaign though. It ends up playing out as a mediocre version of the early Medal of Honor games, where you just clear out bunkers by yourself. Having so much solo gameplay just doesn't make sense in a game that used the motto “no man fights alone.”
The AI isn't bad, but the game never really challenges itself. Most of the fights are linear affairs without much room for differences in the battle. The AI is able to handle itself fairly well, but it makes the fighting a bit scripted and boring on replay.