Guild Wars 2

When specced Warrior gets:

144 second CD \ 15 second duration \ Double Damage (the saving grace)

When specced, Engi gets: (Elixer X)

84 second CD \ 18 second duration \ Engi Specific crit/dodge trait activations

Engineer has 50% chance of getting tornado from Elixir X, instead of rampage. I would argue that tornado is much weaker than rampage, see yourself:
http://wiki.guildwars2.com/wiki/Tornado

And Tornado sucks (at least in ele, maybe engis have something that makes it better)

This is true, and even on Ele tornado is awful, but still, this is about rampage, not elixir X in general