Not sure if all of this was due to lack of professionalism or there is something shady going on here. Although, am not a conspiracy theorist, I find it hard to believe it was caused by high traffic.
Coinbase is the second biggest exchange and poloniex is the 12th, how didn't they expect such a rise in traffic and why they didn't get ready for it (knowing this is not the first time this has happened) and who is going to compensate traders for the losses they suffered during this downtimes?
No one is going to be compensated during unexpected downtimes, the traders themselves will suffer the consequences, just the nature of business of this exchanges. Accept it or move to other so called reliable exchanges you think of. For conspiracist, this could be intentional on part of Poloniex.
Anyways, the big question is:
[1] Should exchanges held liable for this unexpected downtimes during bitcoin spikes?
[2] How about cloud hosting providers, if they are the causes of this downtimes, should they be also liable?
[3] If exchanges are then liable? how can traders be compensated?