SpikesLoL is a necro pvper who is out and about.
Rather than look at cc, I would like to look at the necro's furthest ranged instant cast: Poison (15 block range). Because it is an instant cast that puts a DoT that hampers sprinting, it allows necros to kite very effectively. I would like to see its range reduced to 12. Web and Despair still have 15 block range, allowing the necro to cc and kite, rather than "180 degree turn, instant cast DoT, 180 turn, sprint" version of kiting we have now. Poison has a similar staggering effect to your sprint (and then applies the same every 2 secs for 13 secs) as kick or smite does, at almost 4 times the range.
But: Root has no warm-up and is designed to precede a warm-up damage spell like Bolt (why it breaks on dmg), and Beguiler has 3 cc's (pig, mass pig, beguile). Necro cc's cannot break on damage as they are a tick damage heavy class. Necro's cc also, as themeoff pointed out it can affect the necro's own team. You cannot really compare these classes as simplistically as the OP seems to.
I agree, if they land ALL their skills and kite, they win. I am not disagreeing that necro may need a look, but this quote^ does not highlight the reasons at all. If a DoTing class can land ALL their skills without getting their squishy ass beat in, then they deserve to win. And you cannot say "harmshield gg" because they would have to swap 40 mana from damage to harmshield.
edit: I have no problems with necro's myself, I find them easy to face, but I expect that is because its more difficult for a necro to kite against a ranger than a melee class.