See, I'd say the complete opposite for competitive play.
Yes, HoN has different attitude about it, but when you talk about competitive gaming, I instantly think of casting and tournaments. The mechanics of HoN/DotA are needlessly convoluted for an eSport and frankly, denying and avoiding fights more often than not just doesn't make for a good spectator show. HoN is a nice remake of DotA for those who can't be bothered to reinstall Frozen Throne, but as said before, there's a multitude of reasons why Pendragon and Guinsoo wanted to redesign the game from the ground up.
There's also a reason that S2 are flagging horribly and why their game is dropping players like flies. When DotA2 is released, they'll have literally no reason for HoN to exist as it stands. The game they made so close to the original it could have only been to avoid having to install Warcraft 3 will be obsolete as DotA will now be stand-alone and with the massive support and improvements of Valve.
On the other end of the spectrum, Riot with LoL are geared so heavily towards pushing out spectator-friendly games with their fast paced, no-holds-barred and more gladiatorial game. In this, LoL gives that action side that DotA and HoN won't, and because of their nature, can't bring. This isn't a bad thing in the slightest, but people have to see that they're quite simply not the same game in anything but the map. It's akin to comparing Battlefield to Quake, which is quite frankly ridiculous unless you stoop so low as to argue "Hurr durr they both have guns!"
Just as soon as they get a working spectator/caster mode added to LoL, I can't see anything stopping it at all in the tournament/competitive scene.
Note that this isn't really opinion, so much as simple observation on the state of the genre and the competitive scene it has behind it.
As for the community, LoL does have a share of assclowns, but you tend to find them more in the low ELO ranges than the high, as you suggest. I found that HoN's angst only got higher the better rank you became, which was kind of depressing as I was really trying to enjoy the game. Eventually, I realized that I'd be better off going back to just playing DotA.
Finally, I wouldn't call LoL easier. It's less complex in mechanics, but taking the focus away from the creeps puts a tonne more focus on the human element which is inherently much less predictable. It's less 'follow this plan and it'll be okay' and a lot more 'Have to adapt and be constantly aware of everything'. Here we see the 'Battlefield vs. Quake' element at its clearest.
There's a massive evolving metagame waiting to be found in LoL, but the nature of solo queuing makes the current 'tanky DPS top, solo mid, AD/support bot and a roaming jungler' work amongst uncoordinated groups. It's like why people will just mass lings or stalkers in a PUG teamgame of Starcraft 2. You don't know your team-mates so you resort to faceroll 101.