The ECS A770M-A can excel mainly in one benchmark: price. The board is sold for less than $70 at many e-tailers which makes it the cheapest choice when you are looking for a motherboard that has AM2+ support for the new Phenoms. Even though the board is cheap ECS did not scrap Gigabit Ethernet which is becoming more and more handy nowadays. The eSATA port is a nice addition but not really needed.
In most of our benchmarks we saw the ECS A770M-A lagging behind a bit the competition but you will probably not even notice the speed difference of a few percent during normal use. While the overclocking options in the BIOS are limited you can still reach some basic overclocks with it but there is not much fine tuning possible to get out the last MHz.
Overall this is a fine motherboard for office PCs or systems that are not going to be overclocked. Even though you can (in theory) run Phenom CPUs in AM2 motherboards, this requires a BIOS update from the manufacturer which will not happen in many cases, especially in the budget segment. So to be safe and have an upgrade path a newly purchased motherboard should be AM2+ today, even if you will run it with a normal Athlon64 for a while.