Regarding Spell Usage (vs Characters I have and play)
Smite/Exhaust (Or Flash, depending) - Jungle WW
Flash/Exhaust (Or Ghost, recommended) - Malphite
Teleport/Exhaust - Laning WW
Teleport/Exhaust - Tristana
Teleport/Exhaust - Shaco
Warwick, Trist and Shaco make for extreme Turret killers late-game - Won many purely with a timed Teleport and a nuke on Turrets. If I see myself as the only one with the Teleport Spell (Very common) then it's most likely I'm the one who is forced to do all the solo work on buildings while everyone else is stuck defending, pushing or ganking somewhere irrelevant.
Exhaust is great offensively and defensively, can't see myself without it. Flash is nice but Shaco & Trist already have an equivelant in their talents so are of no benefit in the long run. Warwick can benefit from it at times given he has no slows, only movement increases, which aren't always enough, so it can be used aggressive or defensive.
If I see someone with Smite I assume that means they intend to jungle... But yeah, you do see laners take it from time to time. I don't mind it as it's a free minion kill if you have a character that can struggle to get LH's but it's such a wasted spell in a lane.
If you play a PuG Normal match you're guarantee'd 1-2 people have Heal and likely 2-3 people have Ignite, both horrible for anything other than the early game. Once saw an Ashe who had Heal and Revive - Poor thing went 0/20/0 - Spells aren't an indication of skill or knowledge (I could be completely wrong with my choices) but I do assume a lot about a player from their spells at the start seeing as most don't even talk beforehand or pick a team for unified benefits, just pick whatever character they want.
Seen so many people fighting over Vayne... "Omg let me play Vayne plz, plz omg u n00b" /quit
Thankfully there are plenty of good matches to counter the horrible moments.
You seem to be putting way too high a premium on teleport. You won't see it much except usually on a solo top Shen so he can ult and return before losing his tower. Personally I like to run it on Malz and Karthus for ganking.
Ghost works better on ww than exhaust. And lane ww isn't up to much either, kinda more a fun thing to do.
You're severely undervaluing ignite. Early - mid it's great for kills but all through the game it's the best healing debuff. So if they have a healer grab it, or a mundo, vlad etc.