Why are you leading with a Rogue? Lead with a tankier character, run in and pick off stragglers with the Rogue or flank engaged units and tear them up. I've been running a dual wielding Orlan Rogue in POTD for a while (in The White March currently) and she is a terror. Crits, interrupts and high damage all day with mobility abilities to re-position when necessary. She can't do it all alone, but that's why you have multiple members in a party.
If you rush three Xaurips at level 1-2 without potions then of course you're going to be destroyed; you can't survive their attacks long enough to get the job done. Just sounds like you need to improve your play, melee Rogue is fine when used intelligently. They are not meant to solo groups, not even at low levels.