Spell spam is one of the most noticeable differences between LoL and DotA. In DotA it's generally inadvisable to cast any spell before it's rank 2, so you normally don't cast a spell till you hit level 3 ---- with exceptions, of course. Rank 1 spells in DotA are a trade off where the damage they do for the mana they cost you is usually not worth it, but obviously can be worth it if you're in a situation where you get a kill.linkmastr001 said:EDIT: Oh, another thing I don't like about DoTA is the mana pool, the resource available to most champs to use their abilities. It's just waaay too small. In both games, you can only use a few abilities in the early game before it's depleted, but in DoTA this is always the case, while in LoL, every champ will be able to use their abilities many times at the higher levels without needing extra mana or mana regeneration.
But then again, that's DotA. It's all trade offs.
LoL, on the other hand, is all about spam. I think the difference gets really highlighted when you compare LoL characters that were clearly based on DotA characters, i.e. Blitzcrank [http://leagueoflegends.wikia.com/wiki/Blitzcrank] and Pudge [http://www.dota2wiki.com/wiki/Pudge].
Blitz Rocket Grab is 110 mana at all levels. Pudge Hook 110, goes up 10 each level.
Blitz starting mana is 260 (no runes). Pudge starting mana is 182.
Blitz gets 40 mana per level. Pudge gets 19.5 mana per level.
Blitz level 1 mana regen is 1.32/s. Pudge level 1 mana regen is 0.56/s.
And like, I said, without runes or masteries, and considering how awesome mana shield is on Blitz I normally stack mana on him (Manamume, frozen heart, etc).
It just translates into Blitz being able to Rocket Grab more often than Pudge, and missing an individual Rocket Grab is less painful to Blitz than it is to Pudge.
Uhm, not to say one is better than the other, personally. If you think casting abilities is fun and you want to do more of it, then stuff costs less mana and characters have more mana to work with in LoL, and abilities scale into late game with AP. If you like the trade off, then DotA is more fun.