I say 15 for Spidey with the understanding that 20 is a GIVEN for Luke. But, Luke has been shown to be upgraded in strength/power at least twice to my knowledge and likely more.
based on his showing against Iron Clad alone, I'd put Luke more in the 40 to 50 ton range.
Short answer: He does nothing. He's been a horribly-underused character on the team.
And keep Amadeus Cho the HELL away from the Avengers. Unless it's a "Death Of" special.
Spiderman, from a power stand point, actually isn't well-matched by anyone on the team. Go check out a Rumbles thread, but more imprtantly, even in story, is during Civil War when he took Starks armor apart on him with his speed and strength, and then in the big brawl when everyone watched him just cut loose flying all over the place with his own style that's a combo of strength, speed, agility, and precognition that is totally unmatched. (I believe there's a point in the battle where Reed and someone else are watching him and all they can say is "Spectacular..." "Amazing..."
Really, because of his speed and battle precog, and experience fighting against groups of individuals at a time, Spiderman is one of the true powerhouses on the team. Its just subverted by his personality.
Dude's a veteran hero who has the respect of more of his peers than he realizes or allows himself to.
I dont mind him as an avenger but i think he and wolvie should be benched for someone who needs the spotlight.
Spidey is doing ok.
I've been against Spidey as an avenger, simply because he has so much going for him that he is basically a solo act. You need out-right speedsters to match his agility, his precog makes hims very hard to hurt, he is decently strong, and smart enough to outwit mad scientists. Bring him in on the odd mission, sure I can see that. But a card carrying member -- no way.
Bringing him in on a core avengers team wouldn't be a bad idea, but you make cap effectively useless. Now, if you did an "avengers science team" made of of Spider-Man, Beast, Vision, and <instert PhD avenger here>, I would be all over that.
I'll never get this "He's not powerful" argument. The Avengers have had people like the Black Widow, Hawkeye, the Falcon, the Wasp, Ant-Man, Black Knight, Black Panther, and other non powered heroes, and Spidey is easily stronger than all of them. And he's faster, and more agile. Plus he's an inventive genius, who created his own gadgets and didn't need anyone to build them for him. Unlike a lot of the other Avengers who inherited or were given their gear by another source. Plus, he's got a lot more experience than a lot of other "veteran" Avengers as a superhero. He's more than worthy of having a place on the team.
Him catching all the New Avengers during the battle with Ragnarok was the only time him being an Avenger made sense to me. That was a great issue/ use of Spider-Man's powers. I still don't think him being an Avenger makes a whole lot of sense.
I'm not Captain America, but I wish I was.