The first beta weekend of Call of Duty: Modern Warfare 2 has concluded with an overwhelming feedback from the community. The feedback has mostly been positive, except for a few major design changes for which Infinity Ward has received some substantial criticism.
The map design choices are welcomed by both hardcore and casual fans. The flow of the maps, at least design-wise, has been well received. However, a few other changes disrupt the overall flow of the game in favor of the more "laid back" or "casual" players.
One of the highlights of the criticism is the absence of the classic mini-map. The Call of Duty franchise had a classic mini-map that was unchanged for over a decade until Modern Warfare (2019). The classic mini-map reveals your position for a couple of seconds whenever you shoot your weapon.
This helps make the game more engaging and fun as the players can focus their attention on the "last known location" of the player to hunt them down. This also helps the game flow rather than resulting in a long boring match with limited gunfights. This also encourages camping!
This has always been the staple mini-map for all the previous Call of Duty games. Silencers were introduced in the game to counter this. Any player who wants to stay off the radar can opt for a silencer. The silencers may have their own pros and cons, such as reduced damage range or bullet velocity, but that is understandable. You are hiding from other players while shooting. Some balancing compromises are expected.