c) Are easy Spikes "too good"?
Again, the answer (imo) is yes. There are so many Pokemon that are simply near impossible to stop once Spikes are on the field. Pokemon sweep a significant portion of the metagame with little effort in common battle conditions (easy spikes = creating a common battle condition, where as not "easy" spikes aren't as common). For example, Moltres, Honchkrow, Blaziken, Venusaur, Magmortar, Swellow, Gallade, Raikou, Drapion, Mismagius, Azumarill and Sceptile, anything with Rock Polish, etc (I could list every sweeper in UU I guess :D) are near-impossible to reliably stop. Essentially, anything that's fast and hits decently hard, anything with strong priority, or anything that can boost it's speed and hit hard.
Lets start by looking at Moltres:
Initially, Moltres has quite a few solid and reliable switch ins (as in, they can switch in and force Moltres out) to it. Lets take a look at those Pokemon in the top 50 + Regirock (#51):
- Arcanine
- Raikou
- Milotic
- Umbreon
- Clefable
- Azumarill
- Feraligatr
- Blastoise
- Chansey
- Altaria
- Regirock
11 reliable switch-ins with just SR. Not bad. Now let's see how many of them can switch into an Air Slash or Fire Blast with Spikes:
- Azumarill*
- Altaria**
- Chansey***
*Azumarill loses when it switches into HP Grass: (63.34% - 74.81%). 63% minimum + 25 Spikes + 12.5 Stealth Rock = 100.5% = OHKOed 100% of the time when it switches into HP Grass.
**Altaria can't do shit to Moltres.
***Chansey
barely survives.
Fire Blast vs Chansey: 31.98% average damage (I rounded to 32%)
32 (Fire Blast) + 25 (Spikes) + 12.5 (Stealth Rock) - 6.25 = 63.25% HP. This means Chansey will survive with at most 6.75% (30% min from Fire Blast) which is basically a Stealth Rock switch in.
This removed a ridiculous amount of counters, and the counters that are left are shaky at best. Very shaky. Moltres can essentially sweep with little to no effort with Spikes in play.
Lets look at Swellow next, because it is another common sweeper.
Let's look at the Pokemon who survive a Facade or a Brave Bird without SR/Spikes:
- Aggron
- Altaria
- Arcanine
- Azumarill
- Blastoise
- Claydol
- Donphan
- Drapion (with some investment)
- Kabutops
- Nidoqueen
- Mesprit
- Milotic
- Miltank
- Moltres
- Omastar
- Regirock
- Registeel
- Rhyperior
- Rotom
- Slowbro
- Spiritomb
- Steelix
- Umbreon
- Weezing
That's a fair amount of checks, making it difficult to sweep with Swellow (especially when compared to Moltres). However, let's add Spikes and Stealth Rock into the mix.
- Aggron
- Claydol
- Donphan (Survives with 10% assuming min damage)
- Kabutops
- Mesprit (bulky variants)
- Milotic (Survives with 10% assuming min damage)
- Miltank
- Omastar
- Regirock
- Registeel
- Rhyperior
- Rotom
- Steelix
- Slowbro
- Weezing
Now that durastically reduced Swellows 1-time counters, but worse yet, Swellow has U-turn.
It is unrealistic to think that these Pokemon can survive 1-2 U-turns while taking up to 37.5% every time they switch in and wall Swellow. Lets look at which Pokemon are alright enough to switch into U-turn once, and Facade after that (meaning they need to survive Facade after losing HP from 2 rounds of residual damage (6.5%, 53.125-75% (depending on Stealth Rock damage and Spike damage)) + U-turn damage:
- Aggron
- Registeel
- Rotom
- Weezing
Four Pokemon are left from 24 original counters, who would still otherwise be standing after residual damage + U-turn.
Yes, Swellow will be at 50% from Stealth Rock damage, but we all know that Swellow can easily sweep with that little health since it won't be taking any hits.
Now, these sweepers 'sweeping with little effort' would be situational of Froslass didn't provide "easy Spikes". The fact that Froslass reliably, and easily will set up Spikes means that Swellow and Moltres are by definition sweeping with little effort in common battle conditions.
This is why "easy" Spikes aren't merely "annoying", they are broken.