Vishal,
You can snmp-poll ACE module sameway as you can do for anyother Cisco devices. So you can get ACE statistics sameway as you get for router/switch.
I know that Netqos's Netvoyant product support monitoring of ACE and provides statisitcs such as number of L4 - L7 connections(created/rejected/established) as well as drops information.
I believe you can get this information from other network monitoring tools provided that you compile ACE MIBs in it and enable SNMP in ACE.