Riposte: i genuinely like the skill.. 2k+ damage over 6 seconds with it (also awesome in PvP but that's a different story), very good for taking adds whilst on bosses.
Shadowstrike: I highly disagree.. This is my new favourite Skill. It runs primarily off of dexterity so yours must be super low, but it is instacast and mine does 'up to' 1.8k damage.. Usually hitting around 1.2-1.4k per cast. Though, the bug where you cast it and then are 'out of range' to auto or Quickstrike, is super annoying (and was reported in Beta).
Exposé Weakness: Whilst some Rogues may not want support skills (Smoke Bomb?).. It is nice to have the option. I personally really like Expose Weakness.. It is great for bosses as some skills can be very valuable, so do not want them evaded
Life Drain: I agree, hugely underpowered and a waste of a skill that had huge potential. Was good in one of the first builds in Beta, then nerfed from there-on-out.
Rend: I agree, too weak.. Damage needs doubling or even trippling.
Quickstrike: awesome.
Sneaky: Takes too long to cast.. Cast time should be 1 sec