Personally enjoyed Guardians 1 the most out of the MCU. I'll say I think Winter Soldier is the best of the Captain movies though.
As for a list.
Avengers 1
Guardians 1
Ragnarok
Doctor Strange
At least it doesn't have Murica in the name.
In all honesty I wasn't a huge fan of winter solder. I enjoyed it, yeah but I think there was much better options in the MCU that lost out to it :/