The good things about Endless Legend are Arts (visual and music), Resources, Tech-trees and Region management
But the largest map is not very big (kinda like the Standard size of Civilization) and Diplomacy is somehow weak (which will be improved with that DLC it seems) and 300 turns is low.

I only could conquer one state from my southern neighbor. Managing Technology is hard in this game.
I actually very much like it.
Technology races, or more specifically, World Wonder races were already a thing in Civ. On lower difficulties you could just leasurely research everything in your era and proceed to the next one, but at higher difficulties, you were pretty much dependant on getting the World Wonders before the AI (thanks cheating AI).
In Endless Legend, it's somehow similar. If you focus on a very specific technology branch (say science) and stick with it, you can eclipse other factions in science output if they don't do the same thing, but the obvious tradeoff is that your economical, military and infuence/approval is lacking behind, so you have to play it smart, by either mix-matching some other essential technologies, or stick to it no matter what for the unique victory condition. And you can't simply race to one point and then quickly research that which you passed over as each completed research adds to the research cost for not-yet discovered technologies, meaning if you passed the most basic technologies over in a bid to race ahead in another branch, researching it later will cost you more. The unique and mechanically different factions really shine in this context, because they allow incredibly effective specialization if you stick to their strenghts (say Vaulters going for science victory), or their innate perks can help circumvent some limitations (say Vaulters got for a conquest styled game and their unique science perk helps counteract the lack of investing in science technologies to keep your technological growth at a solid pace).
I do agree though that the game could profit from larger maps and a true infinite turn setting. 600 turns maximum is by no means inadequate if you aim to win the game, but it's too short for those epic game sessions that I enjoyed with CivII, III and IV, some of which went well past the thousand turns. This is reminiscent of the biggest critique I hold against CiV, the mentality to play to win. Sometimes I don't want to play to win, I just want to mess around and see how it goes. Though Endless legend still does it way better than CiV, at least in this game the AI isn't metagaming, it's just that my fun comes with a deadline or the playground not being large enough.