After putting some more hours into it I've gotta say I like it a lot.
The whole lack of last hitting or item buying doesn't seem to affect skill cap much.
The game is easier to get into, however, there is still a massive difference between just good and very skilled players (ie, cloaked characters can actually be seen if you look very well - so many times I've followed in invis and instantly killed enemy novas/zeratuls it's hilarious) . The mechanics are still there and combat is also very fluid and fast paced.
The talent system is, I would dare to say, offers more possibilities than itemization like in LoL. In League of Legends, you would find mostly that the only difference between items for a certain champion (with most having very limited builds) is having more mr or armor - it's a situation difference but doesn't really make a huge gameplay difference, whereas the talent system can totally change the way you play your hero.
There seems to be a lot of possibilities for synergy of talents and different heroes as well so I'd be interested to see how meta shapes up. I'm fairly certain each team would want at least one healer as they seem to quite strong.
I've played a lot of different heroes to lvl5 and it seems that pretty much all of them can be very viable and have very defining strengths.
If anyone is wondering whether they should buy the founders pack or not, I have to say that if you like mobas you should definitely go for it - I myself have got a free beta key but have not hesitated to spend £20.00 for 2 heroes and xp booster just after few hours. The game seems to be extremely polished for a beta.
Also, if anyone is interested in the performance, I'm running it all maxed out on 1920x1200 with just 6950 and haven't noticed the slightest bit of lag/fps drop yet so pretty sure it would run fine even on older systems.