Ok Here goes.
1.Ease of attaining and retaining elite status.

Most FF programs are the same in my opinion,the more you fly the easier it is to move up the ranks,i dont see any advantage or disadvantage Regarding Matmid in this respect and there Elite status is no harder or easier to attain than the rest of the Reigions FF programs.
I managed to reach Gold with Matmid very easily and would have made gold elite if i had continued to fly with the airline.

2. Benefits of elite status for comp upgrades and upgrades with points.

I was never offered a comp upgrade and never managed to get upraded with El Al using points and tried a few times to do so.
I paid for J so was looking to upgrade to first when that cabin was available.
The dissapointing thing for me was on 2 occasions when an empty f cabin was flown i was denied the opportunity to upgrade on points but was asked to pay $500 dollars to upgrade?
So little use for me to acrue miles if i couldnt use them for an upgrade.
Etihad has given me a free f upgrade 4 times from purchased j seat holding silver status plus atleast 6 j to f upgrades using miles and this over a period of 3 years flying with them so not even a regular flyer with the airline.
Emirates never holding gold status on j purchased tickets.
Kuwait i free upgrade to f on a j purchased ticket.
all the other airlines flown were only j class tickets with either no F or i didnt request to use miles.

3. Elite status lounge access benefits.

This is where i think Etihad has everyone beat as there premium lounges beat other midle eastern lounges hands down.
Difficult to compare regarding access through status as i am fortunate to fly at least J on any airline i use but having experienced most major airlines lounge offerings i think Etihad are tops
El Als offering in Tel Aviv is extreamly poor in my opinion,barely compairing with Kuwaits at there hub,and would put it at the bottom of lounge experiences where the others are concerned but in most cases silver stauts on most airlines allows you some sort of lounge access so its the experience you have in the lounge that counts here.

4. Availability and ease of points/mileage redemption for free tickets on both the airline itself and partner airlines

Extreamly Difficult for Matmid to compete with RJ who are One World or Emirates,Etihad etc who have many other airline partners.
I understand the reason why El Al doesnt belong to any seriouse alliance but this hurts there FF program in my opinion.
The lack of alliance membership restricts what you can do with Matmid miles and network routs are limited also so again against Qatar,Emirates,Etihad difficult for Matmid to compete.
Hardly worth trying to redeem Matmid miles for its own flights in my mind unless you just travel mostly on El Al?

5. How generally elites are treated by the airline

Again,its about the experience you receive before you even reach the airport,Etihad,Emirates,Oman all offer a free pick up and return car service,comp hotel for layovers exceeding a certain time limit,free hotels on booked stop overs,etc etc.fastrack imigration services on departure and arrival.
Matmid does none of this to my knowledge,the scrum to get through bagage search and immigration does nothing to enhance its FF program.
As a gold member i wasnt given any preferential treatment on check in or fastrack from anyone else??
So where is the value to me in being a Matmid member?
Even RJ afforded me a free hotel,all transfers,meals,fastrack through immigraton and lounge access and i was on a broze One world status.
Ok,I was on a J ticket but was given the exact same offer as they gave One World Gold so was given priority over non members.
Most of the airlines above gave me some sort of recognition when boarding or after boarding.
Especially on a Gold status ie welcomed by name and spoke to by the cabin services manager offered my preferences(drinks,papers,magazines etc) as indicated in my FF information.
When flying Emirates First class between LHR-BKK i have seen on the cabin services managers passenger information that my name was higlihted as an "Comercially important passenger" and received slightly higer interaction from the cabin crew than non status F passengers not much difference i know but atleast i could see some sort of recognition for my money.
Only Egypt air and El Al was this welcome or recognition not given and having flown both airlines several times i never received any benefit from my FF staus.

6. Your overall impression of the strengths/weaknesses of each program.

No airline has a perfect FF program that will involve a 100% of its passengers being kept happy 100% of the time however For me i have had a poor overall experience of both El Al as an airline and have not received any reall benefit from joining Matmid.
I am sure that a lot of people who are Matmid members can give a different outlook and again this is only my experience of my time flying this airline but having flown and been a member of 20+ airlines i am affraid as an Airline and a FF program El Al and Matmid dont cut it for me because as the national airline of Israel i really was expecting more.