Best Expansions ever

[LegitHyperbole]

OdinHades said:

Half-Life: Opposing Force. I really liked the idea of switching perspective and the add-on was full of neat ideas. It was a little short, but that's ok. I had a blast with it!

Blue Shift was bad though. Really bad. Other than that I usually don't enjoy expansions too much.

Strange I never heard of it, I recall Blue Shift, not that I played it but not opposing force at all.