They would be a midtable team.
In the last 10 years, Dinamo produced:
1. Modric
2. Kovacic
3. Mandzukic
4. Eduardo Da Silva
5. Corluka
6. Lovren
7. FC Kramaric from Leicester
8. CM Brozovic from Inter
9. RB Vrsaljko in Seria A
10. CM Badelj in Fiorentina
11. our player, Halilovic...
They would be a midtable team, but more like a 7th placed team than a 12th placed.
Dinamo has an individual quality of players, but they lack individual experience and experience as a team in bigger matches, because Croatian league is a crap, and they play only 5-6 matches per Season in Europe.
After 2-3 Seasons of gaining experience in EPL, Arsenal's fans would stop making jokes how Dinamo is weaker than Leicester, Palace or Norwich.
As some retard said on Arsenal's forum:
"We played Dinamo Zagreb ffs. Norwich is a ten times better team with probably 10 times more money."
Crazy stuff.
Highlights are available here:
http://lasthighlight.com/dinamo-zagreb-vs-arsenal-highlights-and-full-match/