I've played other games where there's an extraction point that takes you on to the next mission. A great idea, since it does allow you to tidy up any loose ends, and it also lets you re-stock/change your equipment and ammo for both you and your squad, if you have one. This applies especially in those games where you find yourself starting mission 'B' carrying exactly what you had when you finished mission 'A', so you can now hunt around for a bazooka or a sniper rifle if you know you're likely to need these later.
I also favour the 'sandbox' game, which allows for any number of solutions to reach your objective... especially where you get the chance to equip with different ordnance and 'have another go'. This means that some games never lose their play value because each time it's different. Both Hidden & Dangerous and Death To Spies are like this, and I do return to these two over and over as my 'desert island' games.
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