This can be surprisingly effective. Often, people are careful when they see the GTV or some other 5* mega-defence, they work hard to make sure that team gets taken in one shot.
OTOH, a mid-grade team (especially some 4* with emblems) can SEEM like an easy win, and then require several attacks to put to rest. In two of my previous alliances, I tracked defensive and secondary attack stats, and handed out awards of my own, one for each element:
The Scourge - Highest +/- rating: points lost vs points gained. Rarely the top attacker.
The Shrewd Tactician - Highest number of kills (not necessarily one-shots!), tiebreaker to the most points. Sometimes a top attacker, but more often a mid-level player who made good decisions about when to try a one-shot, and when to just clean up.
The Undead Knight - Killed the most often, tiebreaker to the best +/-. Very encouraging for low- to mid-level players who could not use their best tank due to alliance coordination, but still made good use of their attacks.
The Stalwart Shield - Gave up the least points per attack on them. As mentioned above, this was most often won by mid-level players with deceptive teams. The best one that I can recall was someone who was nowhere near our top player took a whopping 17 attacks while giving up less than 11 points per. We cheered mightily for her, as she single-handedly held off all three flips.
The Llama - attacked the most often, tiebreaker to the least total points given up.
The internet carries a different definition for the llama that what I learned. I got the term from playing the original Starcraft online. The poor guy who got found first and got zerg rushed was the llama; it was generally a term of consolation, as that player rarely got a fair chance to play, but it was a necessary sacrifice that let the other players build up. It’s not their fault that they got picked on, but it’s important to let that person know that their play had value to the team.