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The fourth installment is not well-developed at all! It has many simply brilliant ideas, but in everything... how to put it... there's no logical sense of connection (the fifth one suffers from this a little too, just a bit, but still...). All the cities are not just different (which is good), but they simply don't fit together (in my opinion). There's a lot of stuff crammed in, but without taste. Nival Interactive rushed it a lot, really a lot!
Back to the topic. I don't like the second game, please don't take offense. The third game is a masterpiece! Genius! As Kyle said, the fourth game added too many new features too early; they should have at least worked on them! And the fifth game has lost its spirit. Yes, it's a game I love so much that, like with the third game, I can spend nights playing it... But they shouldn't have abandoned the old! They could have created a story about a parallel world where everyone ended up after the explosion, written a chronicle of its development, and presented the current plot, and no one would have criticized them! Let there be new heroes, but there should be mentions of the old ones as the great warriors of the past! Don't Sandro, Jelu, Crag Hack, and Yog (my favorite) deserve that?
Added 4 minutes later
Here's what Russians love to do! Come in and erase all the tainted past! (And the Heroes universe is so tainted by illogical plots; only the old heroes forever, and the plot is just... well, I won't offend anyone). I realized what the mistake of all Russians is! We come in and want to abandon the past! The communists came in and started destroying old Russia! The same thing is happening with Heroes! You can't abandon the past of the heroes! Otherwise, they're not heroes! Let Nival write a chronicle based on what's on the forums (I'm naive, of course)))))))) but still))))) and make a campaign where our heroes learn about the past and the clash of blades!!!! Okay, I'm getting carried away)))) something got to me, sorry))))