I only saw the 2nd half so maybe misread Tigers' game plan, but this is general comment as well.
Keeping Montpellier in their own half isn't a bad game plan, but I think its one for winter conditions and heavy ground when defences are more likely to make mistakes. In summer conditions modern attacks are capable of going the full length of the pitch very quickly so bad kicks are more likely to get punished. Its still not a bad tactic, it just needs better execution and, more importantly, more variety as defences and attacks quickly work out the game plan.
Maybe its commentary bias, but for me Leicester's problem was relying too much "the big man" and this can be a weakness in many teams when their game revolves around one person, be it the big man or the star. Montpellier closed down Nadolo effectively and Tigers seemed to lack a Plan B. Bath had a similar problem with Banahan, when he literally burst on the scene he could win games single handed and all they needed to do was get the ball to him, but defences soon worked him out and it limited Bath's options. There's plenty of other instances, but of course Lomo was the exception!
Anyway, well played Leicester, they came very close and it could have gone either way. With my Wasps hat on the result suits us, if they're outside the top 8 at the end of the season and had won we might have lost our European Cup place if we'd finished 8th.