Games with installments that were significantly easier or harder than the rest?

[StaceyPowers]

What is a series of games that features some installments that are vastly easier or harder than the others on average?

 

[killamch89]

Installing most games is a breeze but the space requirements for games like the more modern COD titles is what really causes the complications.

[Justin11]

When it comes to installation of games from the console store you'll spend alot when it comes to covering the space required for it's download coupled with rough files you'll need to download separate, I am not in for such stress I prefer buying from the online retail or wholesale marketplace.