To the first point:
*raises hand proudly*
Pseudo-gimmicky HO sun team with Choice Specs Solar Power Charizard as wallbreaker. It will either 2HKO or outspeed and 1HKO pretty much everything in the meta, including Chansey with ease. There is literally no safe switch-in, but it's easy to sack something. Send it in early-game and smash shit before foddering is little more than a minor loss. Gives huge advantage because it's so rare, people keep underestimating its wallbreaking power.
To the second:
Electivire does suck but not as much as, say, Scrafty in a tier of super-fast Fighting types (Scarf Keldeo lol outspeeds at +2 and obviously 1HKOs with Secret Sword, as does Scarf Terrakion), because it's got that interesting base 123 Attack vs Scrafty's lol 90 Attack. Not good, but actually quite threatening when it can nab a boost.
Whimsicott is amaaaaazingly annoying. It's like taking a fricking dump on your opponents with priority subseed and Encore... Ultimate team supporter and annoyer. Good for just flat-out stopping a boosting spree with encore then subseeding the opponent to hell and back. Level 1 is an option for gimmicks and healing 100% of your health each turn while maintaining priority.
Charizard is an alright Pokemon, who can hit hard, even Chansey feels the pain, in the sun. Again, that SR Weakness really holds him back, but he has potential to be alright.
Scrafty is far more threatening than E-Vire at least. Jolly Moxie+DD Scrafty boasts awesome coverage in just two moves. He gives no fuck about that lol 90 Attack, cause DD and Moxie allow him to breeze his way through teams. In the right conditions, he can blow a whole team to pieces in a matter of time. Not saying it's unbeatable, but it has a lot of potential to be a deadly sweeper.
E-Vire has no threatening presence in OU, let alone RU. He is VERY predictable, because Motor Drive can be evaded thanks to Team Preview. If they try and use a Pokemon to lure it in, you can just use EQ or any strong attack. He may have a funny 123 Attack but he can't take advantage of it. No boosting moves, and he's weak. Doesn't matter if he has amazing coverage, because things take him down easily. "It's Super Effective"=/=KO.
SubSeed is a joke. Sure, it can annoy the odd shitty PS Ladder Kid once in a blue moon, but it's shut down by practically any Grass-type, which we have Venusaur and Ferrothorn. Also, Alakazam and Reuniclus don't give a fuck due to Magic Guard, and Espeon and Xatu can bounce it back. It's a horrible gimmick Pokemon who has no place on any serious team. And did I not mention that Tornadus-T sends Whimsy running for its money?
That aside, I believe Hail deserves more usage. As a remotely competent user of hail, I've managed to pull off numerous hail teams with success, such as a nice hail offense with Abomasnow, Kyurem-B, Mienshao, and Starmie.