Either way, I think we desperately need to address the issue of UU stall teams. With Weezing, Venusaur and Articuno added to the already stall-icious line up of Hypno, Blastoise, Steelix, Clefable, Quagsire, etc., you can easily make a legal UU team that's completely impenetrable because of a shortage of really effective wall breakers. They severly reduce the pace and creativity of any and all UU team.
This has happened because most of those BL Pokemon that are very capable of wall-breaking (Tauros, Zangoose, Marowak, Rampardos etc) have been dismissed with wide opposition as 'completely broken and unbalancing', in the most part because of that very fact, whereas more defensive threats have received somewhat less opposition, leading to mostly walls being brought down.
The only one that has managed to slip through is Aerodactyl, and just look at the controversy that has caused despite the fact that UU is considered to be very defensive atm. I have noticed some people that have complained about both the stall nature of UU and Aero at the same time, which screams of contradiction. The former implies that UU is too defensively oriented, whilst the latter implies that UU isn't defensively oriented enough.
My stance on the problem? I agree with you, UU is too defensive for its own good. Forget Aero, that thing is quite easily played around with a mixture of sturdy defensive Pokemon (no shortage there obviously), priority moves (no shortage there either), perhaps the odd scarfer (plenty of viable candidates) and most importantly Stealth Rock (every team should have this anyway). It has never been a big threat to me.
The big problem I've noticed is that I have often found it difficult to break down a well built stall team, and there are far too few viable options for getting around it. Clefable is still the biggest problem IMO, followed by Venusaur then Miltank. Those three in particular are incredibly versatile, wall plenty by themselves and are very difficult to take advantage of from an offensive standpoint. Clefable is the worst because there is no backdoor way of taking it out and can effortlessly support a team of walls who have otherwise no form of recovery with Wish, making UU stall so viable. Steelix/Weezing is very overrated IMO and easily exploited by themselves, they owe their success mostly to the more problematic Pokemon already mentioned.
Many people want to resolve this by going back to the time when these Pokemon were still BL, but to be honest with you I wasn't particularly fond of that metagame either. I am more of an optimist who thinks that
more Pokemon should be given a try in UU, not less, as unpopular as that stance may be. Apparently we need to whole community's attention before we even get started on Obi's proposal, which is preposterous if you ask me, but as a second choice I'd prefer to try something new rather than reverting back to the old ways.