Using Rudex for the first time might be quite hard for any new person, it took me time to understand the mechanism through which this decentralised exchange operates. As I peered into how it works, I could understand that the pairs available to trade here are quite limited but as they act as an escrow kind of DEX, which gives the opportunity to swap between chains easily. The mode of operation in this DEX is by one making a transfer to the wallet address specified by the exchange and then the deposit being held in escrow which is then released when the other party complete his/her own part of the deal.
The negative views seen on this exchange is mostly due to its operational method. Not everyone is trusting of an Escrow kind of service and also the DEX is really hard to even operate on a nominal scale. Another thing that makes this exchange unfit for use is the pairs. There is a lot of pairs available but finding one with liquidity is as tough as a nut to crack. Different prices can be seen by different traders but margin differences even along market exchange lines are found on Rudex. Though I will still recommend it's services.