I played through 56% (or something) of the tutorial mode last night and my observations as a first-time player coming from LoL are:
- Hero abilities seem much more simple on Dota. AD/AP "scaling" on League is hard to understand and not defined (unless you look at the wiki) so Dota is easier to understand in that way.
- There are a whole lot of very similar champions. I played Sniper in my first game, which is basically Caitlyn. His E works like Tristana's passive. His ult is practically the exact same thing as Cait's, too. I played the frost archer chick too, basically the same concept as Ashe with that Q ability. That makes it easy.
- There is a whole lot more CC in this game. Against bots on League, I can run into 4 of them and go full ****** and get a quadra. In this, you will get pinned down and die without even putting out much damage it seems.
- The "secret shop" is a unique concept that LoL doesn't incorporate.
- Couriers are very interesting, another thing LoL doesn't have.
- On League, I mainly play AD and often alternate between unlocked and locked camera during a teamfight to keep track of myself and to kite better. You can't do that in Dota.
It'll take me a while to get used to it. It seems like there are a lot more keys you need to make use of compared to what I use in League. The biggest differences to me so far are just the keys, the UI layout, and the fact that you have to actually actively purchase items while involved in stuff on the map.