Civ BE isn't a downgrade just because it doesn't have everything Civ V had. It has things that Civ V didn't. The main problem with BE is all the bugs and a general lack of polish.
And the lack of different victory conditions. We have 4 science ones plus Domination, which profits from the science-affinity-level-relationship. Diplomacy is a joke. No cultural and diplomatic victory to aim for anymore. No religion and tourism to spice up mid to late game. No Great People for the little extra reward here and there. Less meaningful Wonders. Less unit types. Academies and Manufactories are now always available, come partially with disadvantages and are not as powerful anymore.
Sure, we have nice visuals, even three types of textures for every terrain. I like the miasma, I like the aliens and I like the quest system. Yet, in Civ V we dealt with barbarians instead. City-states were built in mini-games with perma quests like "establish a trade route" or "declare war on xyz". So that's that. Everything else is missing.
Yes I like the options to chose from at the beginning of the game EXTREMELY much. Actually the thing that keeps me playing, because I can try out new starts. Yet, the game itself is the same grind everytime.