Basically what happened in Halo was this. Halo CE was awesome, but Bungie didn't mean to make it awesome. They didn't realize people would actually learn how to aim and **** with pistols. They didn't think people would actually be able to aim grenades from across huge maps and land them.
So in Halo 2 they slowed down movement speed, decreased the field of view from 90 to 70 degrees, increased auto-aim and magnetism, made the grenades blow up almost instantly, and added a number of "spray-and-pray" weapons like the SMG. At first Halo 2 was total garbage but after they patched the game to decrease the burst spread on the battle rifle, increased grenade damage, and increased melee damage, the game became playable. When people learned all the weapon glitches like instant reload, BXR, BXB, double-shot, etc., the game became playable and competitive.
Then along comes Halo 3, where they kept all the bad things from Halo 3 (increased auto-aim, magnetism, etc.) and removed all the happy accidents (weapon-glitches). They also decided to make terrible, terrible maps where you can wander around for minutes without seeing anyone because they're so stupidly ****ing large. And they spawn you with a spray-and-pray weapon, the assault rifle, which takes no skill whatsoever to use, because according to Bungie, the spawn-weapon should not be able to perform headshots. Of course in Halo 2 you could change to a viable spawn weapon (the battle rifle) but the battle rifle in Halo 3 is so inconsistant that MLG has had to tune the weapon damage. Last I checked they changed it to 11-bullet kills instead of 12 (each burst shoots three) because you're almost always going to get screwed over by at least one bullet flying out of the targeting reticule because as Bungie says, it's more realistic. Because realism in a game involving 8 foot tall genetically engineered soldiers in 2-ton powered suits who can jump 12 feet and flip a scorpion tank is obviously a consideration. Plus in Halo 3 Bungie added a lot of noob bull**** like man-cannons, missile pods, and portable turrets. Ugh.
Halo CE >> Halo 2 >> Halo 3.
And yeah, the series is actually a lot like Melee. Melee was good more or less by accident, like Halo CE. Halo 2 was an attempt to make Halo suck, and it was somewhat successful. Halo 3 finished if off.
I think Brawl has done a good enough job ruining the Smash franchise that we won't see anything worse, however.
Oh, and the comparison of Brawl to chess is completely ****ing ridiculous. No video game ever has or ever will even come close to the level of strategy involved in chess, especially a fighting game, especially a fighting game designed for six-year-old ******* who've never played a video game in their lives.