So, poloniex is down? Or they are going to be scam?
Its up right now. Maybe it just went down for few minutes while you were checking, you should wait for some time before accusing them of scam.
are you serious? They are going down continuously everyday... check there:
http://poloniex.com/trollbox ; People are leaving polo...
i'm considering switching to bittrex or kraken, does anyone know if the issues polo has faced in the past 1-2 weeks are also being experienced by these two exchanges?
They're not.
Bittrex is a much better exchange than Poloniex - decent trading volume, running for longer, more coins, etc.
Poloniex's activity is extremely suspicious - slow withdrawals; downtime only when a coin pumps; "DDoS attacks" which don't let us trade but do make the coin get dumped in the middle of it, and more.