Because the muscles in your lower legs were tight, I'm presuming you didn't do a whole lot of faster stuff through the winter.
This workout gets you moving at a decent striding speed, while building some "higher-aerobic" conditioning. I can't judge its total volume well, because I don't know how much overall volume you've been doing in the preceding weeks, but it seems like a reasonable session.
Your coach may have been looking at "how" and not just "how fast"--s/he would hope that your times were consistent from one 800 to the next (or they got *slightly* faster), and that you were running with controlled mid-distance form.
Check yourself tomorrow and the next day and see whether you got any lingering soreness, etc.; also understand that your coach might have wanted a moderated effort today, with tougher stuff due in the near future.
Please keep us posted on your recovery from this workout and your overall progression. Thanks.