Home nations and Ireland: Where do they rank?

There is still a chance that all four home nations (England, Scotland, Wales, Northern Ireland) and Ireland will be going to the Euro 2016 finals in France. Never before have all five been to the same major championships but this represents the best opportunity to put that stat to bed. Of the five both England and Wales lead their groups with Northern Ireland 2nd in theirs. Both Scotland and Ireland are in the same group and face a tricky task of overcoming Poland and Germany to qualify.
 However the question that arises from the potential of having all five at the same tournament is, How do they rank against each other?
For me I think they rank as follows

1. England
2. Wales
3. Ireland
4. Scotland
5. Northern Ireland 

England:

England top my list as they have the better players but you would expect that with the highest population of the five. The depth at their disposal is not as good as it used to be with the foreign invasion of the Premier league not helping. 

Wales:

Halfway through the qualifiers and Wales are currently top of their group. Last weekend's 3-0 success in Israel showed how far Wales have come in a relatively short period of time. Gareth Bale is the star of this side backed up in midfield by Aaron Ramsey and Joe Allen however you can't help but think where they would be if Gareth Bale were to be injured, as it was Bale who rescued Wales from embarrassment in Andorra and put Israel to the sword. 

Ireland:

3rd are Ireland and this is being a little optimistic. Yes we lost against Scotland last November but I'm hopeful of a victory over the Scots in the return game in June. The team doesn't have anywhere near the quality of the Irish side in the 1990s or even the start of the 2000s. It's very much a hard-working side similar to Wales minus Bale and Ramsey. The depth isn't there as shown by midfielder Robbie Brady playing at left-back against Poland and Jon Walters being used in a wide role. 

Scotland:

Scotland are 3 points better off than Ireland in the group at the moment but while goal difference might be vital I think what separates Scotland and Ireland is the fact that Ireland managed to sneak a point against Germany. It's that point that could be the final difference between either Scotland or Ireland qualifying or getting a play-off spot. 

Northern Ireland:

A flying start to the group has seen Northern Ireland very much on course for a first ever European championship appearance. Their last major tournament finals was the World cup in 1982 so the long wait is nearly over providing they get over the line. However it has to be noted that their group isn't as strong as the other groups. They lost a head-to-head game with Scotland last week in preparation for their victory over Finland. Manager Michael O'Neill is getting the maximum out of the resources available to him with Kyle Lafferty in good form. Depth isn't there either with the problem of players declaring for the Republic still in fashion among players coming up through the under-age ranks for Northern Ireland.