There’s a bug in Fedora 20 and RHEL 7, where the legacy network service does not set the default route properly. This is due to the fact, that the network service does not evaluate the GATEWAY0 directive in /etc/sysconfig/network-scripts/ifcfg-ethX that is used by NetworkManager.
To set the default route with the legacy network service, simply change GATEWAY0 to GATEWAY:
UUID=57a49f0d-31f9-4b44-9730-4f9778f71521 DNS1=192.168.2.1 BOOTPROTO=none DEVICE=eth0 ONBOOT=yes IPV6INIT=yes HWADDR=46:46:46:46:46:46 TYPE=Ethernet IPADDR0=192.168.2.180 PREFIX0=24 GATEWAY=192.168.2.1 DEFROUTE=yes IPV4_FAILURE_FATAL=no IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_PEERDNS=yes IPV6_PEERROUTES=yes IPV6_FAILURE_FATAL=no NAME="System eth0"
Of course, you have to set DEFROUTE=yes, too. Note that this is going to be fixed in Fedora 21.