For those saying "lolol RA was never serious", many other games have humourous moments in a serious atmosphere to lighten the mood. Fallout as an example doesn't take itself too seriously (crashed UFO random encounter, general inserts, etc) and is one of the best games created. If you're inserting humour to lighten the mood, there's a fine line between how much it needs i.e. lighten the mood but still keep consistency with the serious place it's in. It also depends on the skill of the writers too.
RA3 on the other hand is just a gigantic joke, it's not even satire, rather it's something along the lines of Playboy: The RTS mashed with memes and current trends to sell more.