I have no intention of buying HW2. I played the original and liked it, but I can't STAND the campaigns. I hate getting mobbed by loads of enemies long before I can do anything about it. I dislike the later Dune 2000 missions for the same reason. But the HW premise was fantastic and the game was very playable in skirmish or multiplayer.
As for the C&C series, I have all of them except C&C Generals. Tiberian Sun's storyline was good, but I didn't like the units. Walkers were not nearly as manoeuverable as they should have been (yes, I know GDI is big and slow), Stealth tanks really do suck, and those little laser turrets that NOD gets are woefully underpowered (and over-compensated by those damned artillery tanks). Give me the GDI RPGs any day.
Disc throwers? Gimme a break. Just call 'em grenadiers and be done with it. At least grenades don't massacre your own troops in a big battle quite as often as bouncing discs. Why don't they enter in the Olypmics if they like chucking giant frisbees around?
Stealth stuff was cool if you're playing NOD, and downright bloody annoying if not. Example: when I'm NOD in a three-way skirmish, I can have my entire base stealthed before the AI even finds me. Result: No fun. Another example is when I'm GDI and the enemy Noddy stealths their entire base. They hold off EVERYTHING I throw at them, even if that includes Mammoth MkII, a Ghost Stalker and about a hundred assorted tanks! 'Tactics', such as bombing their power generators, would work if I could FIND the goddamned things before they nuke my base with their Temple! Game balance: abominable.
RA2, on the other hand, is the best multiplayer C&C game I've ever played.