Soldato
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I kinda agree with everything you've said (although I played it on the 360).
For me, it's only really just picked up at Sequence 6, but not by much. I've absolutely no affinity with Connor at all, compared to Ezio he's a shallow chararcter with seemingly no charm at all. I'd have rather stuck with Hayden, who seemed to have more layers - well voice acted too.
And I used to love the Assassination side-quests on AC2, but these (10 so far) have all just been some guy walking around the perimiter of a building
Another irritation is the fact that opportunities for a proper stealth approach are limited - I've been trying to take the Forts by complete stealth, but there are so many guards in there, and no real distraction techniques, that it seems nigh-on impossible, so it ends up being a massive skirmish (and, as you've pointed out, taking on 8+ guards isn't hard so you may as well go brute force).
Seems more action orientated, too much hand-holding in quests, too much 'walk-cutscene-walk-cutscene' moments and very little scope to approach missions.
That, and endlessly running through the empty fields of America feels far less epic than scurrying across the rooftops of 15th century Rome....