I want to invest in good quantity. but it is very hard to rely on hardwallets. MyEthWallet seem good in terms of ease of availability. I need to know if it is enough safe to use MEW?
first thing is myethwallet.org does not exist. Either you are trying to diverge people to a fake page or you are really unaware of MEW.
Correct URL for MEW is MyEtherwallet.org
Now, your statement: It is very hard to rely on hardwallets is entirely false. The most reliable wallets are hardware wallets and not the online ones.
Its always good to go for Trezor or Ledger Wallet.