Mass Effect 3 - Engaging Reapers

it is wierd that in me1 you have cruiser that looks different from that in me3, is it upgraded version, is it completly new one, nevertheless to get back on topic, i think that alliance cruisers in pack of 3-4 can overpower reaper destroyer with ease especially if they have strong fighter-frigate escort for screening, alliance dreadnoughts would no doubt be able to kill destoryer without to much problem, although you have note that SSV Logan (Kilimanjaro class dreadnought) slows reaper destroyer,

but 2-3 dreadnoughts could destroy Sovereign class reaper