Metro isn't as bad as people make out, though reducing a map to 3 chokepoints (made even worse by being between levels) wasn't the smartest design move.
At the very least, it needs another flag on the lower level, so the US isn't bleeding from the get-go.
Ideally though, they should also extend the underground out into the park and add another access point between levels.
Problem with being on the US side is, in an average round, you'll have roughly:
- 8 idiots spamming rockets/'nades
- 8 hanging back with their sights on the top of the escalators
- 8 that'll have a med-pack/ammo-pack/defib in their hands the whole round
Which leaves the task of trying to get an upstairs foothold to the remaining 8...