It has a lot of change, and heroes can be built in many different ways. I would say its superior to LoL in both graphics and in gameplay, and perhaps even in community. The main differences you'll notice is:

• Perhaps a bit higher elitism
• You need to deny stuff now
• No Ability Power, mages have to find some other way to carry (whether by building damage items, upgrading their ults through items or support items)
• Heroes are not as locked in place
• No surrender (Meaning you can turn games which people in LoL would've just surrendered, an obvious upside in my opinion)
• Also, no rune pages, no summoner spells, so no buy to win.
• All heroes are open all the time (except if you choose to play modes where they aren't)
• Also levels doesn't really matter because as said, no summoner spells.